A milkman purchases milk at $5 per litre and mixes 4 litres of water in it. By selling the resultant mixture at the rate of $6 per litre, he earns a profit of 40%. The amount of mixture he had with him to sell was:

Correct answer marked below

10 litres

14 litres

20 litres

24 litres

28 litres

Correct

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What this question tests

Your ability to reason about weighted averages and the composition of mixtures.

Averaging the percentages of two solutions without weighting by their volumes.