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If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work ?
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- 60 days
- 45 days
- 40 days
- 30 days
Correct Option: A
| (A + B)’s 1 day’s work = | 15 |
| B’s 1 day’s work = | 20 |
| ∴ A’s 1 day’s work = | - | 15 | 20 |
| A’s 1 day’s work = | = | 60 | 60 |
∴ A alone will do the work in 60 days.
Second method to solve this question ,
Here , x = 15 , y = 20
| A alone do in = | x - y |
| A alone do in = | 20 - 15 |
| A alone do in = | = 60 days. | 5 |
