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10 men working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days ?
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- 6 days
- 10 days
- 12 days
- 15 days
Correct Option: A
Using Rule 1,
where, x is working hrs/days
| ∴ |  | : : 6 : x | 12 : 18 |
⇒ 15 × 12 × x = 10 × 18 × 6
| ∴ x = | = 6 hours | 15 × 12 |
