Problem-Solving and Data AnalysisMediumOriginal from a percentage of it
Problem-Solving and Data Analysis practice question
In a class, 75% of the students passed a test, and 45 students passed. How many students are in the class?
Answer: 60
0.75 × (class size) = 45, so the class size is 45 ÷ 0.75 = 60.
Common wrong answers
- If you answered 15
- 15 is the number who FAILED (60 − 45).
- If you answered 34
- 34 is roughly 45 × 0.75; the passers are a part, so divide.
- If you answered 33.75
- 33.75 multiplies 45 by 0.75 instead of dividing.
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