60 boys can complete a work in 40 days.how many men need to complete twice the work in 20 days  Choose the correct choice from the following answers.
A) 160
B) 170
C) 180
D) 190
E) 240

Rationale: "one man can complete the work in 40 * 60 = 2400 days = one time work to complete the work twice it will be completed in let m be the no . of worker assign for this therefore the eqn becomes m * 20 = 2 * 2400 m = 240 workers answer : e"
Answer: E