Q199
A and B can together finish a piece of work in 30 days. They worked on it 20 days and then B left. The remaining work was done by A alone in 20 days. A alone can finish the work in = ?
A.
60 days
AnswerB.
54 days
C.
48 days
D.
50 days
Answer: Option A
Solution
Answer: Option A
Solution:
| (T.W.) 60 |
|
| 2 units/day | ↓ |
| 30 days (A + B) |
| (T.W.) 2 0 |
|
| 1 units/day | ↓ |
| 20 days (A) |