A can do a piece of work in 20 days. He worked for 8 days. Then B alone finishes the remaining work in 12 days. In how many days can B complete the whole work alone?
Show answer & explanation
Correct answer: A
Explanation
A's one day's work = 1/20
Work done by A in 8 days = 8/20 = 2/5
Remaining work = 1 − 2/5 = 3/5
B completes 3/5 of the work in 12 days
B's one day's work = (3/5) / 12 = 3/60 = 1/20
Time taken by B to complete the entire work = 20 days