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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Percentages
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Q)

2 pumps, working 7 hours a day, can empty a tank in 3 days. How many hours a day must 3 pumps work to empty the tank in 1 day?


( A ) 10
( B ) 12
( C ) 14
( D ) 16

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