If 20 men can build a wall 66 metres long in 8 days, what length of a similar can be built by 86 men in 8 days?	Choose the correct choice from the following options.
A) 283.8 mtrs B) 378.4 mtrs C) 478.4 mtrs D) 488.4 mtrs E) 578.4 mtrs

Rationale: "if 20 men can build a wall 66 metres long in 8 days , length of a similar wall that can be built by 86 men in 8 days = ( 66 * 86 * 8 ) / ( 8 * 20 ) = 283.8 mtrs answer : a"
Answer: A