Question:What same number must be added to each term of the ratio `7 : 13` so that the ratio becomes `2 : 3` ? 

A `1` 
B `2` 
C `3` 
D `5` 

+ Answer
D 

+ Explanation
Let `x` be added.

Then, `(7 + x)/(13 + x) = 2/3`

`iff 3(7 + x) = 2(13 + x)`

`iff x = 5`

+ Report

Md. Habib Ullah

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