75 boys can complete a job in 24 days. How many men need to complete the job twice in 20 days
Select the correct option:
A) 160
B) 170
C) 180
D) 190
E) 200

Rationale: one man can complete the job in 24 * 75 = 1800 days to complete the job twice he would need 3600 days . thus , to complete the job in 20 days , 3600 / 20 = 180 men are needed . answer : c
Answer: C