Question:A solid metallic cylindrical of base radius `3` cm and height `5` cm is melted to form cones is ; 

A `45o` 
B `1350` 
C `4500` 
D `13500` 

+ Answer
D 

+ Explanation
Volume of cylinder 

`= (π xx3 xx 3 xx 5) cm^3`

`= (45 π) cm^3.

volume of `1` cone

`= (1/3 π xx 1/10 xx 1/10 xx 1)`

`= π/300 cm.^3`

Number of cones 

`= (45 π xx 300/π)`

`= 13500`.

+ Report

Irin Moni

Editor, VCampus

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