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Question

66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:

Options:
A .  84
B .  90
C .  168
D .  336
Answer: Option A

Let the length of the wire be h.


Radius = \(\frac{1}{2}mm=\frac{1}{20}cm. Then,\)


\(\frac{22}{7}\times\frac{1}{20}\times\frac{1}{20}\times h= 66 \) 


h =  \(\left(\frac{66\times20\times20\times7}{22}\right)=8400cm=84 m.\)


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