Free Practice Question
PS · Problem Solving
505-555
Mixture
In a 1.5 kg mixture of sand and iron, 30% is iron. How much sand needs to be added so that the proportion of iron becomes 15%?
Answer Choices
Correct answer marked belowA
150gms
B
300gms
C
450gms
1.5kg
Correct
E
2.5kg
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Explanation
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Official Explanation
Official
In the 1.5 kg mixture, there are 450 grams of iron (30% of 1,500 grams). If we add x grams of sand, the total mixture will be 1,500 + x grams. We…
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Comments
2
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A
AlkaApr 5, 2024
Great question!
A
AnkitaNov 9, 2024
Thankss
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
505-555
Type
PS
Category