# SAT Math Multiple Choice Practice Question 550: Answer and Explanation

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**Question: 550**

**7.**

In the figure above, if *l*_{1} || *l*_{2} 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.