Problem-Solving and Data AnalysisMediumCombined percent from two groups
Problem-Solving and Data Analysis practice question
In a school, 30 of the 120 boys and 45 of the 130 girls walk to school. What percent of all the students walk to school?
Answer: 30
Walkers: 30 + 45 = 75. Students: 120 + 130 = 250. 75/250 = 0.30 = 30%.
Common wrong answers
- If you answered 25
- 25% is the boys' rate alone (30/120).
- If you answered 29.8
- 29.8 is the average of the two group percents (25% and 34.6%), which ignores the groups' different sizes.
- If you answered 34.6
- 34.6% is the girls' rate alone (45/130).
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