55 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 m  B) 88 m  C) 120 m  D) 70 m  E) None
Sol.   Let the length of the wire b h.   Radius = 1/2 mm = 1/20 cm. Then,   22/7 * 1/20 * 1/20 * h = 55 ⇔ = [55 * 20 * 20 * 7 / 22= 
<gadget id="calculator">55 * 20 * 20 * 7 / 22</gadget>
<output>7_000</output>
7000cm= 70 m.   Answer 70 m
<result>D</result>
55 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be :