alleryA vessel has 20 L of pure milk. 4 L is removed and replaced by water, and this is repeated once. Milk left?
A12.8 L
B12 L
C14.4 L
D13.6 L
Answer & Solution
Correct answer: A. 12.8 L
Each operation keeps 4/5 of the milk, so 20 x (4/5)^2 = 12.8 L remains.
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