A Shopkeeper wants to make 1/7th profit on her cost by diluting, with water, concentrate to specification and sells it at the rate at which she bought a litre of the concentrate. find the water:concentrate ratio in the diluted solution.

Correct answer marked below

1:5

1:6

1:7

Correct

1:11

7:8

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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.