A grocer buys two kinds of sugar at $1.70 and $1.10 per kg respectively. In what proportion should these be mixed, so that by selling the mixture at $1.56 per kg, 20% of the profit is gained?

Correct answer marked below

5 : 2

5 : 3

9 : 7

2 : 1

1 : 2

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.