Question:A right cylindrical vessel is full of water. How many right cones having the same radius and height as those of the right cylinder will be needed to store that water ? 

A `2` 
B `3` 
C `4` 
D `8` 

+ Answer
B 

+ Explanation
Let radius of each be r & height of each be h.

Then, volume of cylinder

`= π r^2 h.`

volume of `1` cone

`1/3 π r^2 h.`

Number of cones needed

`= (π r^2h)/(1/3 π r^2 h)`

`= 3.`

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Irin Moni

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