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A and B together can complete a work in 12 days. A alone can complete in 20 days. If B does the work only half a day daily, then in how many days A and B together will complete the work ?
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- 10 days
- 20 days
- 11 days
- 15 days
Correct Option: D
B’s 1 day's work
| = | - | = | = | ||||
| 12 | 20 | 60 | 30 |
| ∴ B's | day's work = | ||
| 2 | 60 |
∴ (A + B)'s 1 day's work
| = | + | = | = | ||||
| 20 | 60 | 60 | 15 |
[ ∵ B works for half day daily]
Hence, the work will be completed in 15 days.
