SAT Math Multiple Choice Practice Question 39: Answer and Explanation

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Question: 39

17. If 2a + 3b = 17 and 2a + b = 3, then a + b =

A. 1
B. 5
C. 7
D. 7.5
E. 10

Correct Answer: B

Explanation:

B. By adding the two expressions, you discover that 4a + 4b = 20, so a + b = 5. You can also solve for the variables to get a = -2 and b = 7, which gives you the same answer.

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