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

An electric pump can fill a tank in 6 hours. Because of a leak in the tank, it took 7 hours to fill the tank. If the tank is full, how much time will the leak take to empty it ?


( A ) 37
( B ) 42
( C ) 35
( D ) 21

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