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A does 4/5 of a piece of work in 20 days; He then calls in B and they finish the remaining work in 3 days. How long B alone will take to do whole work ?
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37 1 days 2 - 37 days
- 40 days
- 23 days
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Correct Option: A
Using basics of Rule 2,
A can do the whole work in
| = | = 25 days | 4 |
| Remaining work = 1 - | = | |||
| 5 | 5 |
| ∴ (A + B)’s 1 day’s work = | 15 |
| and A’s 1 day’s work = | 25 |
∴ B’s 1 day’s work
| = | - | = | = | |||||
| 15 | 25 | 75 | 75 |
| ∴ B can finish the work in | days | 2 |
| i.e. 37 | days | 2 |
