Question
A container has 40 litres of milk. 10 litres of the milk
is removed and replaced with water. The same process is repeated once more. How much milk is left in the container?Solution
After one replacement, milk left = 40 x 30/40 = 30 litres After second replacement, milk left = 30 x 30/40 = 22.5 litres Or directly: Milk left = 40 x (3/4)^2 = 22.5 litres
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