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Bunuel
If the sum of two angles of a parallelogram is 100°, what is the average (arithmetic mean) of the measures of the other two angles?

(A) 50
(B) 90
(C) 130
(D) 180
(E) 260

A parallelogram’s angles always sum to 360 degrees. If the sum of two angles of a parallelogram is 100 degrees, then the remaining 2 angles must sum to 260 degrees, and so the average of those two angles is 260/2 = 130 degrees.

Answer: C
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