Question:The radii of two cylinders are in the ratio of `2 : 3` and their heights are in the ratio of `5 : 3.` The ratio of their volume is : 

A `4 : 9` 
B `9 : 4` 
C `20 : 27` 
D `27 : 20` 

+ Answer
C 

+ Explanation
Let their radii be `2x, 3x` and heights be `5y, 3y.`

Ratio of their volumes

`= (π(2x)^2 xx 5y)/(π (3x)^2 xx 3y)`

`= 20/27`

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Irin Moni

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