A student separates a mixture of iron filings and sugar by placing it in front of a magnet. If the mixture weighs 45 g and after magnetic separation 18 g of iron filings are collected, what percentage of the mixture is iron filings?
Answer
40%
The correct answer is 40% — Present the result as 40%.
Step-by-step solution
- Compute the fraction of iron filings: 18 g ÷ 45 g = 0.4.
- Convert to percentage: 0.4 × 100 % = 40 %.
- Present the result as 40%.
Common mistake: Omitting the multiplication by 100
Concept tested: Magnetic separation percentage
Published · How this solution was prepared and checked
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