A can holds 90 litres of pure milk. A milkman takes out 9 litres and pours in 9 litres of water, and then repeats this once more with the mixture. How many litres of milk are left in the can?

Question

Accepted Answer

72.9. Each operation keeps (90 − 9)/90 = 9/10 of the milk. Milk left = 90 × (9/10)² = 72.9 litres.

A can holds 90 litres of pure milk. A milkman takes out 9 litres and pours in 9 litres of water, and then repeats this once more with the mixture. How many litres of milk are left in the can?

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