36. If 18 pumps can raise 2170 tonnes of water in 10 days, working 7 hours a day; in how many days will 16 pumps raise 1736 tonnes of water, working 9 hours a day?
[A] 6
[C] 8
[B] 7
[D] 9
Answer : B
Explanation :
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| Let the required number of days be x. Then, |
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| Less pumps, More days (Indirect Proportion) |
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| Less weight, Less days (Direct Proportion) |
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| More hours / day, Less days (Indirect Proportion) |
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| | Pumps | 16 : 18 | | Weight | 2170 : 1736 | | Hours/day | 9 : 7 | |
| :: 10 : x |
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| (16 x 2170 x 9 x x) = (18 x 1736 x 7 x 10) |
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| | 18 x 1736 x 7 x 10 | | 16 x 2170 x 9 | | = 7 | |
Title : Chain Rule Q36
Description : 36. If 18 pumps can raise 2170 tonnes of water in 10 days, working 7 hours a day; in how many days will 16 pumps raise 1736 tonnes of water,...
Rating : 5
