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6 pipes working 10 hours a day can empty a cistern...

This question belongs to Arithmetic Ability Pipes And Cistern
Pipes and Cistern
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6 pipes, working 10 hours a day, can empty a cistern in 3 days. How many hours a day must 9 pipes work to empty the cistern in one day?

Answer & Solution
Correct Answer: Option A
6 × 10 × 3 = 9 × x × 1
x = 20 Answer
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