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A can do a piece of work in 20 days and B in 15 days. With the help of C, they finish the work in 5 days. C can alone do the work in
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- 5 days
- 6 days
- 10 days
- 12 days
Correct Option: D
| A’s 1 day’s work = | |
| 20 |
| B’s 1 day’s work = | |
| 15 |
| (A + B + C)’s 1 day’s work = | |
| 5 |
| ∴ C’s 1 day’s work = | - | - | |||
| 5 | 20 | 15 |
| = | = | = | |||
| 60 | 60 | 12 |
∴ Required time = 12 days
