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A mixture containing 42% of ethanol is mixed with another mixture containing 27% ethanol in the ratio 1 : 1. Find the percentage of ethanol in the mixture formed.

A mixture containing 42% of ethanol is mixed with another mixture containing 27% ethanol in the ratio 1 : 1. Find the percentage of ethanol in the mixture formed. Correct Answer 34.5%

The mixture is mixed in a ratio 1 : 1. Let the quantities of mixtures mixed be 100 and 100 litres, respectively. The amount of ethanol in the mixture formed = 100 * 42 / 100 + 100 * 27 / 100 = 42 + 27 = 69 litres The percentage of ethanol in the mixture so formed = 69 / 200 * 100 = 34.5%

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