From a vessel full of pure milk, 6 litres are drawn and replaced with water. This is repeated once more, after which milk and water are in the ratio 16 : 9. What is the capacity of the vessel?
Correct answer D. 30 litres
Explanation
Milk fraction left = (1 - 6/x)^2 = 16/25, so 1 - 6/x = 4/5, giving 6/x = 1/5 and x = 30 litres.
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