Question:The average age of boys in the class is twice the number of girls in the class.If the ratio of boys and girls in the class of `36` be `5 : 1`,what is the total of the ages (in years) of the boys in the class ? 

A `490` 
B `196` 
C `420` 
D `360` 

+ Answer
D 

+ Explanation
Number of boys 

`= (36 xx 5/6) = 30`

Number of girls `= 6`

A average age of boys 

`= (2 xx 6) = 12 years`

:. Total age of boys 

`= (30 xx 12) years`

`= 360 years`

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Irin Moni

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