Question:The average age of  a class is `15.8 years`The average age of the boys in the class is `16.4 years` while that of the girls is `15.4 years.What is the ratio of boys to girls in the class 

A `1 : 2` 
B `3 : 4` 
C `3 : 5` 
D None of these 

+ Answer
D 

+ Explanation
Let the ratio be` k : 1`.Then

`k xx 16.4 + 1 xx 15.4`

`= (k + 1) xx 15.8`

`or (16.4 - 15.8) k`

`= (15.8 - 15.4)`

`or k = 0.4/0.6`

`= 2/3`

:. Required ratio

`= 2/3 : 1`

`= 2 : 3`.

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