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Sunday, December 17 2017 @ 04:08 AM CST
 Forum Index >  Test Paper Related >  Primary 6 Matters
 Ratio question- help
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By: Strawberry (offline)  Thursday, February 23 2012 @ 01:10 PM CST (Read 885 times)  
Strawberry

Yesterday, the ratio of the number of stamps Ali had to that of Zainal's was 9:11. This morning, Zainal gave Ali 255 stamps. Now the ratio of the number of Ali's stamps to Zainal's stamp is 3:2. How many more stamps has Ali than Zainal now?

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By: pkrdd (offline)  Thursday, February 23 2012 @ 10:40 PM CST  
pkrdd

Hi,

For this problem, take note that the total number of stamps altogether is constant. so you have to apply constant total method which is - to equate units to same before and after

Before Ali : Zainal = 9: 11 ie total 20 units

After Ali : Zainal = 3:2 (multiply by 4 to make total units as 20)
= 12: 8

Zainal gave 255 which is 11u - 8u = 3u
u = 255/3 = 85

Now Ali has 4units more than Zainal (12 -8) = 4 * 85 = 340 stamps more

Hope this helps.

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