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A can do a piece of work in 20 days and B in 30 days. They work together for 7 days and then both leave the work. Then C alone finishes the remaining work in 10 days. In how many days will C finish the full work ?
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- 25 days
- 30 days
- 24 days
- 20 days
Correct Option: C
Work done by A and B in 7 days.
| = | + | |||
| 20 | 30 |
| = | = | = | ||||
| 60 | 60 | 12 |
So, Remaining work
| = 1 - | = | |||
| 12 | 12 |
∴ Time taken by C
| = | × 10 = 24 days. | 5 |
