If 20 men can build a wall 112 metres long in 6 days, what length of a similar wall can be built by 10 men in 3 days? Choose the correct answer.
A) 65 mtr .	B) 28 mtr	C) 70 mtr .	D) 78 mtr .	E) 17 mtr .

Rationale: "20 men is 6 days can build 112 metres 10 men in 3 days can build = 112 * ( 10 / 20 ) x ( 3 / 6 ) = 28 meters answer : b ."
Answer: B