Problem-Solving and Data AnalysisHardPercent of a percent of a class
Problem-Solving and Data Analysis practice question
Of the 400 students in a school, 30% take art. Of the students who take art, 25% also take music. How many students take both art and music?
Answer: 30
30% of 400 is 120; 25% of 120 is 30.
Common wrong answers
- If you answered 100
- 100 is 25% of 400, ignoring the art condition.
- If you answered 120
- 120 is the number taking art.
- If you answered 220
- 220 adds the two percentages of 400.
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