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A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day ?
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- 10 days
- 12 days
- 15 days
- 20 days
Correct Option: C
(A + B + C)'s 1 day's work
| = | + | + | ||||
| 20 | 30 | 60 |
| = | = | |||
| 60 | 10 |
| A’s 2 days’ work = | = | |||
| 20 | 10 |
Work done in first three days
| = | + | |||
| 10 | 10 |
| = | = | |||
| 10 | 5 |
[A's work for 2 days + (A + B + C) work on 3rd day]
Hence, the work will be finished in 15 days.
