Discussion :: Time and Work
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A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:
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Answer : Option C
Explanation :
| (B + C)'s 1 day's work = |  | 1 | + | 1 |  | = | 7 | . |
| 9 | 12 | 36 |
| Work done by B and C in 3 days = | | 7 | x 3 | | = | 7 | . |
| 36 | 12 |
| Remaining work = | | 1 - | 7 | | = | 5 | . |
| 12 | 12 |
| Now, | 1 | work is done by A in 1 day. |
| 24 |
| So, | 5 | work is done by A in | | 24 x | 5 | | = 10 days. |
| 12 | 12 |
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