Question

If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?

• A. 60
• B. 54
• C. 45
• D. 42

Answer 1

Answer:

A. 60

total work = LCM(15 , 20) = 60 efficiency of A and B = 60/15 = 4 efficiency of B = 60/20 = 3 efficiency of A = 4 - 3 = 1 A alone complete the work in = 60/1 = 60 days