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Sunday, October 22 2017 @ 05:49 PM CDT
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 ratio question - pls help
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By: karseng (offline)  Sunday, March 18 2012 @ 05:29 AM CDT (Read 1047 times)  
karseng

The ratio of no. of stickers Alex had to the no. of stickers Beng Han had was 1:3. After each of them recieved 25 stickers, the ratio became 3:4. How many stickers did they have altogether at first?

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By: echeewh (offline)  Sunday, March 25 2012 @ 08:37 PM CDT  
echeewh

Hey Kar Seng,

The solution is as follows:

(Apply Constant Difference concept - Difference before is same as difference after )

<Before>

A : B Diff
1 : 3 2u

<After>

3 : 4 1u

In order that the difference before and after remain the same, we need to get an equivalent ratio for <After> by multiplying 2x.

6 : 8 2u

Comparing this new <After> ratio to the <Before> ratio, you will see that both A and B has an increase of 5 units each.

Therefore, 5u --> 25
1u --> 5

Total number of stickers (at first) = 4u --> 4 x 5
= 20
============================================

Hope this helps.

Cheers,

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By: karseng (offline)  Sunday, March 25 2012 @ 10:29 PM CDT  
karseng

got it. Tx!

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