# SAT Math Multiple Choice Practice Question 454: Answer and Explanation

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**Question: 454**

**16.** If the average measure of two angles in a parallelogram is *y* , what is the average degree measure of the other two angles?

A. 180 – *y*

B. 180 -

C. 360 – 2*y*

D. 360 + *y*

E. *y*

**Correct Answer:** A

**Explanation:**

**A** Let's begin by drawing a parallelogram and plugging in a number for *y*, say 50, and calling the other two angles *x*:

Because there are 360 degrees in a quadrilateral, you know that 2*x* + 100° = 360°, which means *x* = 130°. So, you're looking for the choice that gives you 130 when *y* = 50°. You simply plug 50 into all of the answer choices to find that A is the only one that works.