ISEE Word Problems Question 170: Answer and Explanation

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Question: 170

1. If ab = 5, then which expression is equal to b ?

  • A. a + 5
  • B. a – 5
  • C. –a + 5
  • D. –a – 5

Correct Answer: B

Explanation:

The answer is B

First, subtract a from both sides: -b = 5 - a. Next, divide both sides by -1: b = -5 + a (or a - 5).

Plug in values for a and b, such that a - b = 5. If a = 7 and b = 2, then the correct answer will equal 2 when you plug in 7 for a.

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