66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be: Select.
A) 66 B) 84 C) 80 D) 72 E) 68

Rationale: "let the length of the wire be h . radius = 1 / 2 mm = 1 / 20 cm . then , ( 22 / 7 ) x ( 1 / 20 ) x ( 1 / 20 ) x h = 66 . h = ( 66 x 20 x 20 x 7 ) / 22 = 8400 cm = 84 m . answer b"
Answer: B