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

84
90
168
336

Correct Answer: 84

Explanation:

Let the length of the wire be h

Radius =	1	mm	=	1	cm.	Then,
	2			20

⟹	22	x	1	x	1	x h = 66.
	7		20		20

⟹ h =	❨	66 x 20 x 20 x 7	❩	= 8400 cm = 84 m.
		22

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