Free Practice Question
PS · Problem Solving
555-605
Mixture
A mixture of 30 kg contains 10% salt, while another mixture has 5% salt. How many kg of the second mixture should be combined with the first to achieve a solution that is 6% salt?
Answer Choices
Correct answer marked belowA
30
B
45
120
Correct
D
150
E
None of these
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Explanation
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Official Explanation
Official
Using the alligation method: 10 -- 5 -- 6 -- 1 -- 4. This indicates that for every 1 part of the first mixture, there are 4 parts of…
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Comments
2
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M
MocSep 24, 2024
This is definitely a test-day trap
M
MichoJun 10, 2024
thanks for the answer
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.
Details
Difficulty
555-605
Type
PS
Category