8 litres are drawn from a flask containing milk and then filled with water. The operation is performed 3 more times. The ratio of the quantity of milk left and total solution is 81625. How much milk the flask initially holds?
A
10 ltr
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B
20 ltr
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C
30 ltr
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D
40 ltr
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E
None of these
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Solution
The correct option is B 20 ltr Let initial quantity be Q and final quantity be F F=Q(1−8Q)481625=(1−8Q)435=1−8Q Q=20