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Art of Problem Solving: Introducing Ratios

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Art of Problem Solving

Art of Problem Solving

Күн бұрын

Art of Problem Solving's Richard Rusczyk introduces ratios.
Learn more about problem solving at our website: bit.ly/ArtofPro...

Пікірлер: 435
@YAABKA1
@YAABKA1 6 жыл бұрын
the ratio of kids to adult at a party 5:2 ( It's really simple this is what you do ) Add together the ratio ( 5+2=7) Than the answer which is 7 multiply by the ratio example (7*5=35) and also ( 7*2=14) there are 35 kids and 14 adults
@z84charmz
@z84charmz 5 жыл бұрын
That is just the easy part smh
@7Logik
@7Logik 5 жыл бұрын
Wow
@emmanuelvillanueva1766
@emmanuelvillanueva1766 5 жыл бұрын
So the answer is: 5+2=7 7×5=35 7×2=14
@miagym3154
@miagym3154 5 жыл бұрын
Omg thank you so much, much simpler👍😂
@AliHussain-uh9xt
@AliHussain-uh9xt 5 жыл бұрын
My man just made me remember that working out that my techer told me thx
@jaironeduque8241
@jaironeduque8241 3 жыл бұрын
2021 still watching from 9 years before this video
@jaironeduque8241
@jaironeduque8241 3 жыл бұрын
@coolbOy 118 eyyy
@J-dawg.
@J-dawg. 3 жыл бұрын
relatable
@wut.5297
@wut.5297 3 жыл бұрын
Yess
@maryamimran3618
@maryamimran3618 3 жыл бұрын
i am with you
@constantineq643
@constantineq643 2 жыл бұрын
Join the club
@emmagracecooks6827
@emmagracecooks6827 6 жыл бұрын
are you kidding!! he is the best teacher EVER!! I have watched every other video about ratios and this one actually made sense! THANK YOU
@cold6334
@cold6334 3 жыл бұрын
it does?...idk man
@user-bn8fo4py5k
@user-bn8fo4py5k Жыл бұрын
I was so lost in class but I knew I had u for backup 🎉🎉😂😅
@evageorgieva3576
@evageorgieva3576 6 жыл бұрын
If you are confused... First Problem: 5+2=7 7x2=14 ( which is the number of adults) we now know that we have to multiply 7 by 5 to find the number of kids: 7x5=35 and if you are asked to write your answer as a ratio: 35:14 ----------- *Always write the ratio the way they began it in the problem: KIDS TO ADULTS. Second Problem: 5-3=2 ( to find the difference between adults and kids ) ( difference is 2 ) 3x5=15 ( to find total number ) 15-2=13 13x3= 39 (number of kids) 13x5=65 (number of adults) and if you are asked to write your answer as a ratio: 39:65 ----------- *Always write the ratio the way they began it in the problem: KIDS TO ADULTS. I hope that helped some of you. :)
@Lorna-AnneCampbell-qh4mo
@Lorna-AnneCampbell-qh4mo Ай бұрын
Mad how mad how this still useful twelve years later watching this in 2024
@richaka
@richaka 7 жыл бұрын
Dude, you are making this harder than it is. 5kids = 2adults, xkids = 14Adults. solve for x? Cross multiply, you get 2x = 70, divide both sides by 2, you get x = 35.
@zaviondenton7992
@zaviondenton7992 2 жыл бұрын
i dont understand your theory
@emmanuelukevwe1547
@emmanuelukevwe1547 Жыл бұрын
Yeah. Very easy to work it out that way. This guy is really confusing and rounding . Literally got confused for this simple question 🤦‍♂️
@humbleobot7615
@humbleobot7615 Жыл бұрын
It's not for you but for kids
@original2858
@original2858 Жыл бұрын
Which 35 is correct as you suggested but kids are getting altogether which they’ll add 35 to guest and get that amount however kids are only adding the answer they get from cross multiplying instead of adding to get “altogether” teachers are now showing this way
@original2858
@original2858 Жыл бұрын
I got a question; A barn is drawn 3/4 inch=4 feet. If the actual height of the barn is 59 feet, what is the height of the barn in the drawing?
@escarface
@escarface 10 жыл бұрын
I've watched like 6 videos and this help put the final thought process into motion. I wish all videos would explain the thought process of the last problem. This is where most of the confusion comes from
@vincentxie3090
@vincentxie3090 5 ай бұрын
Hello, are you still active in your channel
@YAABKA1
@YAABKA1 6 жыл бұрын
The problem is not maths or the formula he used but communication we all don't see things the same that can make something simple very hard to understand all he was saying was 26 more people and he jumps to 13 not going in great detail I must thank him doe for putting this video up THANKS Those who wants to go into more detail the second ratio please look into this 1. 3=5 - 2 MORE ADULTS 2. 6=10 - 4 MORE ADULTS 3. 9=15 - 6 MORE ADULTS 4. 12=20 - 8 MORE ADULTS 5. 15=25 - 10 MORE ADULTS 6. 18=30 - 12 MORE ADULTS 7. 21=35 - 14 MORE ADULTS 8. 24=40 - 16 MORE ADULTS 9. 27=45 - 18 MORE ADULTS 10. 30=50 - 20 MORE ADULLTS 11. 33=55 - 22 MORE ADULTS 12. 36=60 - 24 MORE ADULTS 13. 39=65 - 26 MORE ADULTS SOME THINK IF YOU MULTIPLY BY 2 ( WHERE DID THE 2 COME FROM? WELL EVERY 3 KIDS THERE IS 5 ADULTS THAT IS 2 MOR EXTRA ADULTS) THAT WILL GIVE YOU 26 THAT IS 13 BECAUSE ( 13X2 = 26) now let’s go back to the original ratio which was 3:5 so let’s see 13 MULTIPLY by 3 gives me 39 KIDS and also do the same for the other part 13 multiply BY 5 GIVES ME 65 ADULTS THAT IS 26 MORE ADULTS ARE YOU STILL CONFUSED LETS SIMPLY 65-39= 26 I HOPE THAT HELPS
@fergusthomson821
@fergusthomson821 5 жыл бұрын
So is his final answer wrong?
@NoxiousLynx
@NoxiousLynx 2 жыл бұрын
thank you! this was very well communicated unlike the dude in the video who didn't communicate clear enough.
@khandohenders5478
@khandohenders5478 3 жыл бұрын
Thank you so much, ive struggled with this for long, but you have made it simple for me to understand.
@LordVader066
@LordVader066 Жыл бұрын
understand this ratio
@sprite3514
@sprite3514 7 жыл бұрын
That odd pause at the begging......
@zynkui5206
@zynkui5206 6 жыл бұрын
Cindy Prokop beginning*
@nickgill6639
@nickgill6639 4 жыл бұрын
That is what you noticed
@chaaks9816
@chaaks9816 6 жыл бұрын
hahah i didnt get it at all
@tarungogoi7560
@tarungogoi7560 6 жыл бұрын
Thanks for making the video it helped me in the exam room
@yolandasteenkamp3862
@yolandasteenkamp3862 3 жыл бұрын
ok so this is a easy way so the ratio of kids to adult at a party 5:2 ( It's really simple this is what you do ) Add together the ratio ( 5+2=7) Than the answer which is 7 multiply by the ratio example (7*5=35) and also ( 7*2=14) there are 35 kids and 14 adults
@dizzysdiamonds
@dizzysdiamonds Жыл бұрын
Wow ...that's how you start a video !!! Why didn't I have someone like you 25 years ago
@JanexConfetti
@JanexConfetti 3 жыл бұрын
doesn't his fingers hurt from all that writing on the board
@appleplays9047
@appleplays9047 3 жыл бұрын
Prob
@effecteyvee864
@effecteyvee864 2 жыл бұрын
they hurt from this ratio
@ameenjakobra3373
@ameenjakobra3373 2 жыл бұрын
i didnt understand from this method :(
@Mary-cd3cl
@Mary-cd3cl 3 жыл бұрын
You know what I’m going to subscribe because you’re awesome
@mashupervance5404
@mashupervance5404 5 жыл бұрын
Its so hard Uhmm.. 😤😥😧😩😰I have a question😑😮😴 | in 5:2= 2.5:2.2 | where did you get 2•5 and 2•2?😒😫😫😫
@kul795
@kul795 2 жыл бұрын
Didn't understand anything
@saritasalome5304
@saritasalome5304 Жыл бұрын
I don’t understand the 2nd problem 😩 how you get the 13 ?
@SebastianJc
@SebastianJc 8 күн бұрын
I did the thinking of 2x7 is 14 then 5x7 is 35
@jamesshaw3622
@jamesshaw3622 3 жыл бұрын
One of the worst parts about math for me was learning how to do one problem, multiple ways. I can learn how to solve a math problem multiple ways, but it usually confuses me in the end, during the step-by-step process. I get the multiple solutions confused with each other.
@Kraeeer7i
@Kraeeer7i Жыл бұрын
The intro is so nostalgic
@galaxycookie75
@galaxycookie75 4 жыл бұрын
This is helpful as now we can not go to school because of corana, we can learn how to do Ratios from here , l was confused in Ratios but after watching this video l am not so thanks , l will share this video with my class.
@galaxycookie75
@galaxycookie75 4 жыл бұрын
Btw the start was kind of weird because you had a little pause in the start
@vegtea1637
@vegtea1637 6 жыл бұрын
This helped me a lot
@kxcrimson1454
@kxcrimson1454 8 жыл бұрын
you don't explained the problem!! you just worked it out like if we know!! very confusing!! please explain why u are doing each step!!! WHY!!!!
@abiudwilsonkavara3575
@abiudwilsonkavara3575 5 жыл бұрын
Total conversion cost is N$500 000. Direct labour and the other element of conversion cost are in the ratio of 3 : 2 to total conversion cost. Direct material is 5 times more than indirect material and 3 times more than direct labour. Indirect material is already included in the N$500 000 conversion cost. Required: Calculate the following: Direct material used Direct labour Manufacturing overheads Manufacturing cost Primary cost
@an.jahnke7632
@an.jahnke7632 Жыл бұрын
i'd bet big money that your students love you.!, Very nice presentation.
@brisk9459
@brisk9459 4 жыл бұрын
Where did 13 come from in the 2nd problem
@VaresBoii
@VaresBoii 4 жыл бұрын
That’s what I’m still trying to figure out!?!?!??
@VV-sl6eq
@VV-sl6eq 4 жыл бұрын
It’s the difference , so 5 minus 3 = 2units, which is 26, so one unit is 26 divided by 2 which equals 13 :)
@sapphirecranfield38
@sapphirecranfield38 3 жыл бұрын
Angela Yang I don't understand ;-;
@VV-sl6eq
@VV-sl6eq 3 жыл бұрын
@@sapphirecranfield38 So the child's units is 3 and the adult's units is 5. You want to find the difference, so the difference of units is 5-3=2 units. But as the problem says, the difference of adults and kids is 26. Since 2 units and 26 are both the difference of adults and kids, 1 unit equals 26 ➗ 2 = 13. You probably don't need this part, but the kids are 5 units and 1 unit equals 13, so there are 65 kids.
@sapphirecranfield38
@sapphirecranfield38 3 жыл бұрын
Angela Yang that helped a lot tysm
@evangelineperez7688
@evangelineperez7688 9 ай бұрын
I am so confused
@shreyadhap9981
@shreyadhap9981 3 жыл бұрын
Really good for me to learn
@raychellekrisbalolong9272
@raychellekrisbalolong9272 3 жыл бұрын
I don't understand the second one
@BigDawg-uv2mz
@BigDawg-uv2mz 6 жыл бұрын
where did u get two to multiply
@sk_davron1142
@sk_davron1142 9 жыл бұрын
it did not help me at all what you did does not make any sense at all thank you for your video but it was hard to understand
@YAABKA1
@YAABKA1 6 жыл бұрын
shorter way is 26 divide by 2 =13 Than 13*3=39 kids 13*5 = 65 adults isn't that easy
@YAABKA1
@YAABKA1 6 жыл бұрын
the ratio of kids to adult at a party 5:2 ( It's really simple this is what you do ) Add together the ratio ( 5+2=7) Than the answer which is 7 multiply by the ratio example (7*5=35) and also ( 7*2=14) there are 35 kids and 14 adults
@zuhaibahmed6078
@zuhaibahmed6078 6 жыл бұрын
why did not you do same as you solve the first Q. i.e 5:2 means 5+2=7 then 7x5=35, 7x2=14. Is it not the same as first ? why can't we do 5+3=8, then 8x5=40, 8x3=21?
@tonysimon843
@tonysimon843 6 жыл бұрын
Sk_Davron 123 that's so true hi my friend
@tonysimon843
@tonysimon843 6 жыл бұрын
It's very nice to wach but board👎👎👏👊😜😮💣💣🔫🔫🎭💊🅿
@deepi1723
@deepi1723 3 жыл бұрын
I see more than 5 videos but i can't understand when i see this video my all concepts are clear
@allanlam7669
@allanlam7669 7 жыл бұрын
For everyone that doesn't understand immediately, you will, eventually. Because whilst he doesn't write down the words "group", or "grouping", he mentions and emphasizes it, and really stresses it throughout the video. The fact that he doesn't specifically outline it, makes the video especially memorable and fulfilling to understand, because you really have to concentrate, both on what he writes, and on what the says, at the same time! I thoroughly enjoyed it after watching it a few times to fully understand it. You realise what how experienced he is. He earns my trust. It may not kick in today, but it will stick longer and when we need it, it will be there.
@pilotrahulrajbhar
@pilotrahulrajbhar 4 жыл бұрын
Why dont u cross multiple
@linacherpelis316
@linacherpelis316 Жыл бұрын
2023 here!
@markxsons9330
@markxsons9330 10 жыл бұрын
Daniel's mother gives Daniel and his brother the same amount of allowance every month. By mistake, Daniel gets more allowance this month. The ratio of his allowance to his brother's allowance is 7 : 4. Daniel decides to give his brother some money so that both of them will have the same amount. If Daniel has $238 now, how much must Daniel give to his brother? Plz reply...
@leonardbriffa2193
@leonardbriffa2193 9 жыл бұрын
Mark Xsons ratio 7:4 and daniel gets 238dollars. thus 7 times X is 238. X is 238/7=34. now find his bros pay. 4x34=136. total dished out by mom. 238+136=374,divide by 2=187 each but daniel got more and his bro less--238-187=51 dollars he needs to give his bro to come equal
@eternalending8807
@eternalending8807 6 жыл бұрын
136
@original2858
@original2858 Жыл бұрын
Cross multiply doesn’t work for these problems. Basically if is 39 cows: 26 pigs and you have 52 pigs how many animals together? Answer is 117. 26+26 is 52 so you know it’s 2 times you have to do 39 cows. Which is 78 then just add 56 and 117 is total animals.
@pheonadasilva6608
@pheonadasilva6608 5 жыл бұрын
its pretty easy thanks for this video it helped me very much
@ernestnadome9120
@ernestnadome9120 4 жыл бұрын
U make it seem so easy
@jasmeena2008
@jasmeena2008 6 жыл бұрын
Please could you write the English translation below (cc)
@rarokadia
@rarokadia 3 жыл бұрын
It means that they are captions
@zaviondenton7992
@zaviondenton7992 2 жыл бұрын
In a bicycle shop, the ratio of tricycles to bicycles is 6:11. Calculate the amount of bicycles in the shop given that there are 90 tricycles in the shop.
@chalky666
@chalky666 Жыл бұрын
bro this has helped alot not gonna lie
@Gen3ralGrimReaper
@Gen3ralGrimReaper 3 жыл бұрын
On the first radio problem, how did he figure out he needed to multiple 2•5 & 2•2? On the second ratio, how did he figure out 13? I’m lost.
@HayxChannel1610
@HayxChannel1610 3 жыл бұрын
Same 😌
@pamelachuks5205
@pamelachuks5205 Жыл бұрын
@@HayxChannel1610 am also lost l don't know how he realized 13
@l0nlym1lk17
@l0nlym1lk17 3 жыл бұрын
yooooooo math test tomorrow. and I'm British so you know im gonna do badly if I don't revise. wish me luck guys
@YAABKA1
@YAABKA1 6 жыл бұрын
1. 3=5 - 2 MORE ADULTS 2. 6=10 - 4 MORE ADULTS 3. 9=15 - 6 MORE ADULTS 4. 12=20 - 8 MORE ADULTS 5. 15=25 - 10 MORE ADULTS 6. 18=30 - 12 MORE ADULTS 7. 21=35 - 14 MORE ADULTS 8. 24=40 - 16 MORE ADULTS 9. 27=45 - 18 MORE ADULTS 10. 30=50 - 20 MORE ADULLTS 11. 33=55 - 22 MORE ADULTS 12. 36=60 - 24 MORE ADULTS 13. 39=65 - 26 MORE ADULTS SOME THINK IF YOU MULTIPLY BY 2 ( WHERE DID THE 2 COME FROM? WELL EVERY 3 KIDS THERE IS 5 ADULTS THAT IS 2 MOR EXTRA ADULTS) THAT WILL GIVE YOU 26 THAT IS 13 BECAUSE ( 13X2 = 26) now let’s go back to the original ratio which was 3:5 so let’s see 13 MULTIPLY by 3 gives me 39 KIDS and also do the same for the other part 13 multiply BY 5 GIVES ME 65 ADULTS THAT IS 26 MORE ADULTS ARE YOU STILL CONFUSED LETS SIMPLY 65-39= 26 I HOPE THAT HELPS
@otakuelai4761
@otakuelai4761 2 жыл бұрын
Its the little things that counts❤
@crocodileguy4687
@crocodileguy4687 5 жыл бұрын
I think you did a good job explaining
@silxbeats
@silxbeats Жыл бұрын
You made this video very interesting to watch...
@tocacuddles9439
@tocacuddles9439 Жыл бұрын
Ty
@painful4711
@painful4711 6 жыл бұрын
Umm my first question would be where at
@AtlantisPKXD
@AtlantisPKXD 3 жыл бұрын
This is alot of help
@GohramXD
@GohramXD 4 жыл бұрын
I hate maths PLZ ✋ 🛑 STOP 💔
@tarungogoi7560
@tarungogoi7560 6 жыл бұрын
Very nice video I loved this method
@johnmarkalambra2395
@johnmarkalambra2395 5 жыл бұрын
me too
@Mohammadaliedits
@Mohammadaliedits Жыл бұрын
"So were done" *stares into your soul*
@shainaswaby4210
@shainaswaby4210 4 жыл бұрын
this helped a lot thank you I have a test on Monday and I now have a better understanding of ratio thank you so much 🥰
@dainaokraku2523
@dainaokraku2523 Жыл бұрын
Did you do well gess not😢
@Kattie1995
@Kattie1995 5 жыл бұрын
Wait why did you do 2 times 2?
@DaRealNoobKing
@DaRealNoobKing Жыл бұрын
Theres a method for 3 ratios so imagine 36 docs for student A, B and C and ratio is 1:3:5 now 1+3+5=9 36/9=4 4x1=4 4x3=12 and 4x5=20 so 4, 12, 20 for the people
@crazyy488
@crazyy488 4 жыл бұрын
Pls dont judge my working out First question 14 divide by 2 = 7 7 X 5 = 35 Secound question 3 : 5 the gap between 3 and 5 is 2 and there is 26 more then kids, 2 divided by 26 = 13, 13 X 3 = 39
@mariammariam-ue1sy
@mariammariam-ue1sy 5 жыл бұрын
You made it complicated but Thank you though.
@BaelieYoung
@BaelieYoung 10 жыл бұрын
What kind of board are u using in this video?
@vincentxie3090
@vincentxie3090 5 ай бұрын
Hello, are you still active in your channel
@genricmaraon7681
@genricmaraon7681 10 жыл бұрын
i dont under stand a think man how did u come up on dose numbers...pls explain it sir.
@YAABKA1
@YAABKA1 6 жыл бұрын
1. 3=5 - 2 MORE ADULTS 2. 6=10 - 4 MORE ADULTS 3. 9=15 - 6 MORE ADULTS 4. 12=20 - 8 MORE ADULTS 5. 15=25 - 10 MORE ADULTS 6. 18=30 - 12 MORE ADULTS 7. 21=35 - 14 MORE ADULTS 8. 24=40 - 16 MORE ADULTS 9. 27=45 - 18 MORE ADULTS 10. 30=50 - 20 MORE ADULLTS 11. 33=55 - 22 MORE ADULTS 12. 36=60 - 24 MORE ADULTS 13. 39=65 - 26 MORE ADULTS SOME THINK IF YOU MULTIPLY BY 2 ( WHERE DID THE 2 COME FROM? WELL EVERY 3 KIDS THERE IS 5 ADULTS THAT IS 2 MOR EXTRA ADULTS) THAT WILL GIVE YOU 26 THAT IS 13 BECAUSE ( 13X2 = 26) now let’s go back to the original ratio which was 3:5 so let’s see 13 MULTIPLY by 3 gives me 39 KIDS and also do the same for the other part 13 multiply BY 5 GIVES ME 65 ADULTS THAT IS 26 MORE ADULTS ARE YOU STILL CONFUSED LETS SIMPLY 65-39= 26 I HOPE THAT HELPS
@siouxdfroy845
@siouxdfroy845 5 жыл бұрын
YAABKA1 I ain’t reading that
@almacastro1412
@almacastro1412 4 жыл бұрын
Nice video
@tristantiongson7544
@tristantiongson7544 3 жыл бұрын
Ty :)
@xhlcus88
@xhlcus88 4 жыл бұрын
*That reminds me of body parts*
@Team_sza
@Team_sza 3 ай бұрын
I THOUGHT I WAS THE ONLY ONE 😭
@hanna7190
@hanna7190 2 жыл бұрын
Pov: it's 2021 and ur watching this vid for ur module
@scholium3370
@scholium3370 8 жыл бұрын
that was a beautiful presentation, such a variety of techniques too! well done.
@vincentxie3090
@vincentxie3090 5 ай бұрын
I'm pretty sure he is using a interactive whiteboard for these question
@kingdomman1947
@kingdomman1947 4 жыл бұрын
what if . the numbers where odd
@pramodrekhamys
@pramodrekhamys 4 жыл бұрын
Thank you very much for the vedio
@tarungogoi7560
@tarungogoi7560 6 жыл бұрын
😊😊😊nice video
@Laurel3000
@Laurel3000 5 жыл бұрын
Thx 4 the help! (You saved me with my math homework!)
@bonk549
@bonk549 2 жыл бұрын
I have test tommorow im nervous but this will help me out so goodluck me
@johndungca2505
@johndungca2505 5 жыл бұрын
ty sir
@yscarnage8345
@yscarnage8345 3 жыл бұрын
thanks bro i can use this method for my ppe exams
@doublerubyadventures
@doublerubyadventures Жыл бұрын
I'm new thank you for the help and I loved the energy so I'm a new subscriber
@spaceboiclub
@spaceboiclub 5 жыл бұрын
Thank you very much! :)
@cannadybell5566
@cannadybell5566 Жыл бұрын
I have a test wish me luck
@iamghostofuchiha6786
@iamghostofuchiha6786 5 жыл бұрын
5:2 5 -*14 2 5*7-35
@nmerimgbeahuruike7629
@nmerimgbeahuruike7629 4 жыл бұрын
Very informative and the concept is clearly taught.
@ashleymaluks657
@ashleymaluks657 2 ай бұрын
I understood the first example but the second one yhoo i don't understand it completely
@lindacarter4543
@lindacarter4543 9 жыл бұрын
Are you the one that does number theory?
@cookielife9570
@cookielife9570 4 жыл бұрын
Ratio always messes my mind up and makes me so confused.. 😑
@unbeatablevito50
@unbeatablevito50 4 жыл бұрын
Same
@echo4619
@echo4619 4 жыл бұрын
Same
@Ahmad-ne9co
@Ahmad-ne9co 2 жыл бұрын
Proved helpful.... Cool method
@ratiogod9158
@ratiogod9158 2 жыл бұрын
This ratio cooler
@Asphodel_gabby
@Asphodel_gabby Жыл бұрын
THANK YOU
@idahseoforeng1492
@idahseoforeng1492 3 жыл бұрын
I did not understand but now I do thanks
@ranger7yago306
@ranger7yago306 4 жыл бұрын
4:20 so confusing the dots :(
@SaifUllah-ii3dp
@SaifUllah-ii3dp 4 жыл бұрын
dots means time so 5.2 means 5x2 :)
@0menadds
@0menadds 5 жыл бұрын
Cool ratio stuff. Thanks
@kais8585
@kais8585 10 жыл бұрын
Good Job buddy.. keep it up!
@sararani6331
@sararani6331 4 жыл бұрын
Who is the X in the second question
@jamesnoellejavier7990
@jamesnoellejavier7990 3 жыл бұрын
Why not just add the ratio then multipy the ratio?
@justinmwansa8366
@justinmwansa8366 Жыл бұрын
I wish you a very happy birthday on
@lilithperalta5126
@lilithperalta5126 6 жыл бұрын
The dot should be x sir...
@siouxdfroy845
@siouxdfroy845 5 жыл бұрын
Katsuki Bakugou x and a dot is the same thing, guessing you aren’t in middle school? 😐
@MsHarikrisna
@MsHarikrisna 5 жыл бұрын
Can somebody help me solve this? Nadeem had some local and foreign stamps. The ratio of the number of local stamps to foreign stamps was 3:4. She gave away 28 foreign stamps and the ratio of the number of local stamps to the number of foreign stamps became 9:8. How many local stamps did Nadeem have? How many foreign stamps did Nadeem have in the end? Pls. help, need to explain and practice my son about Ratio.
@udow.7167
@udow.7167 3 жыл бұрын
X = number of local stamps; Y = number of foreign stamps I.) X + 4/3X = Y II.) X + 8/9X = Y - 28 Now you put I.) into II.) to replace the Y: III.) X + 8/9X = (X + 4/3X) - 28 some minor calculation to get X: X + 8/9X = (X + 4/3X) - 28 |+28 X + 8/9X + 28 = X + 4/3 X | 4/3=12/9 => X + 8/9X + 28 = X + 12/9X |-1X - 8/9X 28 = 4/9X |*9/4 63 = X. This is the number of local stamps. 63 * 4/3 = 84. This is the number of foreign stamps in the beginning. 63:84 - this is the initial ratio of 3:4. 84 - 28 = 56. This is the number of foreign stamps in the end. The ratio is now 63:56 or 9:8.
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@rainbowng1814
@rainbowng1814 6 жыл бұрын
So i have a question If 700coins are shared among A,B and C. It is known that the ratio of A to B is 6:7, and the ratio of A to C is 2:5. Find the number of coins in C's share. So my problem is, I know A:B =6:7 , A:C= 2:5 But to find C's share out of 700, I need to find A:B:C, how do I calculate that?
@udow.7167
@udow.7167 3 жыл бұрын
You take A as X. B in that case would be 7/6X. C is 5/2X Now it's easy: X + 7/6X + 5/2X = 700 Makes X = 150. A = 150; B = 150 * (7/6); C = 150 * (5/2) A = 150, B = 175; C = 375.
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