ISEE Mathematics Achievement Question 319: Answer and Explanation

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Question: 319

3. Four less than a certain number is two-thirds of that number. What is the number?

  • A. 1
  • B. 6
  • C. 8
  • D. 12

Correct Answer: D

Explanation:

D First, translate the English into math and then use PITA to test the choices. Four less than a certain number translates to n - 4, and two-thirds of a number translates to × n. So the equation is n - 4 = × n. Now, Plug In the Answers to find the one that satisfies the equation, starting with (C). If n = 8, then the equation will read 8 - 4 = (8). Since 4 ≠ , eliminate (C) and try another choice. Try (D): if n = 12, then 12 - 4 = (12), which is 8 = or 8 = 8. Since 12 works, stop here. The correct answer is (D).

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