Free Practice Question
PS · Problem Solving
555-605
Mixture
If you have 60 liters of a 4-percent salt solution, how many liters of water need to be evaporated to achieve a 12-percent solution?
Answer Choices
Correct answer marked below40
Correct
B
36
C
30
D
20
E
18
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Explanation
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Official Explanation
Official
To find out how much water must be evaporated, we start with the initial solution: Water..................... Salt ................... Total 58.8 ......................... 2.4 ...................... 60 (4% salt concentration) After removing 'y' liters of water, we…
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Comments
2
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K
KshitizAug 23, 2024
got this wrong on my practice
J
JotiMay 10, 2024
Great!
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