CAT 2018 Allegations and Mixtures Question (Hard)

Question

A 20 ethanol solution is mixed with another ethanol solution, say, S of unknown concentration in the proportion 1 3 by volume. This mixture is then mixed with an equal volume of 20 ethanol solution. If the resultant mixture is a 31.25 ethanol solution, then the unknown concentration of S is

Accepted Answer

Step 1 Let the unknown concentration of solution S be First mixture 20 solution S mixed in 1 3 ratio total 4 parts Ethanol content 1 20 3 x 4 20 3x 4 Step 2 This mixture is then mixed with equal volume of 20 solution So, final ethanol average of - 20 3x 4 - 20 Resultant concentration is 31.25 So, 20

CAT 2018

Quantitative

Allegations and Mixtures

Hard

A 20% ethanol solution is mixed with another ethanol solution, say, S of unknown concentration in the proportion 1:3 by volume. This mixture is then mixed with an equal volume of 20% ethanol solution. If the resultant mixture is a 31.25% ethanol solution, then the unknown concentration of S is

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