Question:How many lead shorts each `0.3` cm in diameter can be made from a cuboid of dimensions `9 cm xx 11 cm xx 12 cm ?` 

A `7200` 
B `8400` 
C `84000` 
D `72000` 

+ Answer
C 

+ Explanation
Volume of each lead shot 

`= 4/3 π xx (0.3/2)^3`

`= 4/3 xx 22/7 xx 27/8000`

`= 99/7000 cu. cm.`

:. Number of lead shots 

`= (9 xx 11 xx 12 xx 7000/99)`

`= 84000.`

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Irin Moni

Editor, VCampus

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