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A can do a piece of work in 12 days and B in 20 days. If they together work on it for 5 days, and remaining work is completed by C in 3 days, then in how many days can C do the same work alone?
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- 10 days
- 9 days
- 12 days
- 15 days
Correct Option: B
Work done by (A + B) in 5 days
| = 5 |  | + |  | = 5 | | | 15 | 20 | 60 |
| = | = | |||
| 60 | 3 |
| Remaining work = 1 - | = | |||
| 3 | 3 |
| ∵ Time taken by C in doing | work = 3 days | 3 |
∴ Required time = 3 × 3 = 9 days
