ISEE Mathematics Achievement Question 64: Answer and Explanation

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Question: 64

8. If ab + 4 = 52, and a = 6, b =

A. 4
B. 8
C. 21
D. 42

Correct Answer: B

Explanation:

The correct answer is (B). If a = 6, ab + 4 = 52 becomes 6b + 4 = 52.

If 6b + 4 = 52

6b = 52 - 4

6b = 48

b = 8