ISEE Mathematics Achievement Question 263: Answer and Explanation

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Question: 263

9. One-fifth of the students in a class chose recycling as the topic for their science projects. If four students chose recycling, how many students are in the class?

  • A. 4
  • B. 10
  • C. 16
  • D. 20

Correct Answer: D

Explanation:

D For word problem questions, translate the words to their math equivalents: if 4 (the students who chose recycling) is equal to one-fifth of the students in the class, then 4 = × n, where n is the number of students in the class. To solve, multiply both sides by 5, and n = 20. There are 20 students in the class. The correct choice is (D).

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