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12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours a day will empty the same reservoir in 12 days?
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- 15
- 9
- 10
- 12
- 15
Correct Option: C
On the basis of given details in question , we have
Let x be number of pumps
∴9 : 6 :: 12 : x = 12 : 15 :: 12 : x
⇒ 9 × 12 × x = 6 × 12 × 15
| ⇒ x = | = 10 | |
| 9 × 12 |
