SAT Math Multiple Choice Practice Question 550: Answer and Explanation

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Question: 550

7.

In the figure above, if l1 || l2 and x = 55, then y + z =

A. 120
B. 145
C. 175
D. 180
E. 195

Correct Answer: C

Explanation:

C Because you have parallel lines, let's identify the big and small angles. The small angles measure 65°, so the big angles measure 115°. So x + y = z = 115. If you add everything together and substitute x = 55, you get 55 + y + z = 230, so y + z = 175.

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