Question:The ages of `X` and `Y` are in the ratio of `3 : 1`. Fifteen years hence, the ratio will be `2 : 1`. Their present ages (in years) are : 

A `30, 10` 
B `45, 15` 
C `21, 7` 
D `60, 20` 

+ Answer
B 

+ Explanation
Let the ages of `X` and `Y` be `3x` and `x`.

`(3x + 15)/(X + 15) = 2/1` or

`3x + 15 = 2x + 30`  or

`x = 15`.

`:.` Present ages of `X` and `Y` are `45` years

and `15` years respectively.

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Md. Habib Ullah

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