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A can do a piece of work in 12 days and B in 15 days. They work together for 5 days and then B left. The days taken by A to finish the remaining work is
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- 3
- 5
- 10
- 12l
Correct Option: A
| Work done by A and B in 5 days = 5 |  | + |  | = 5 | | | 12 | 15 | 60 |
| Work done by A and B in 5 days = 5 × | = | = | 60 | 12 | 4 |
| Remaining work = 1 - | = | 4 | 4 |
| ∴ Time taken by A = | × 12 = 3 days. | |
| 4 |
Second method to solve this question ,
Here, m = 12, n = 15,p = 5
| Time taken by A = | days | |
| n |
| Time taken by A = | ||
| 15 |
| Time taken by A = | = 3 days | |
| 15 |
