Solution A consists of 25% chemical C and 75% chemical D by volume; Solution B contains 35% chemical C and 65% chemical D. If a mixture of A and B results in a solution that is 28% chemical C, what percentage of the mixture is Solution A?

Answer Choices

Correct answer marked below

15%

30%

50%

70%

Correct

85%

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Explanation

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Official Explanation

Official

To solve this problem, we can use the allegation method. The final mixture has 28% of chemical C; Solution A has 25% chemical C and Solution B has 35% chemical C. We can set up the ratio using the differences: [m]A / B =…

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Comments

KHJun 23, 2024

Thankss

saranyaJan 16, 2025

thanks for posting

What this question tests

What it tests

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

Common trap

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