Question: A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?
[A].40
50
54
60
[A].
[B].
[C].
[D].
Answer: Option D
Explanation:
| (A + B)’s 20 day’s work = | 1 | x 20 | = | 2 | . | ||
| 30 | 3 |
| Remaining work = | 1 – | 2 | = | 1 | . | ||
| 3 | 3 |
| Now, | 1 | work is done by A in 20 days. |
| 3 |
Therefore, the whole work will be done by A in (20 x 3) = 60 days.