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Questions  >>  Olympiad-Math  >>  Class 6  >>  Math  >>  Analytical Reasoning
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Q)

Water is filled in a cylindrical vessel in such a way that its volume doubles after every five minutes. If it takes 30 minutes for the vessel to be full, then the vessel will be one fourth full in


( A ) 15
( B ) 10
( C ) 20
( D ) 25

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A)

Take 1 litre for first 5 minutes. Then it becomes double afterwards every five minutes. We now get, 1, 2, 4, 8, 16, 32 for 5 mins, 10 mins, 15 mins, 20 mins, 25 mins, 30 mins. Total litres we get is “32” and 1/4th of this will be “8” which occurs at 20 mins

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