ISEE Word Problems Question 170: Answer and Explanation
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Question: 170
1. If a – b = 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.