Verified Answer :

A triangle always has 180 degrees. 
180 = x + 60 + 20
180 = x + 80
100 = x
So our answer is B.

efish12

The answer would be B because all 3 angles on a triangle must add up to 180 degrees. Since the two angles you do know add up to 80, you need the last angle to be 100 degrees.

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