22 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be :	Choose the correct choice from the following answers.
A) 84 m B) 28 m C) 120 m D) 137 m E) none

Rationale: "sol . let the length of the wire b h . radius = 1 / 2 mm = 1 / 20 cm . then , 22 / 7 * 1 / 20 * 1 / 20 * h = 22 ⇔ = [ 22 * 20 * 20 * 7 / 22 ] = 2800 cm = 28 m . answer b"
Answer: B