SAT Math Multiple Choice Practice Question 137: Answer and Explanation

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Question: 137

5. Given that a + c = 7 and b - c = 4, a + b must equal

A. -11
B. -3
C. 3
D. 7
E. 11

Correct Answer: E


E. Don't waste your time trying to figure out what a, b, and c equal. The key here is noticing what happens when you add the first two equations together:

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