Answer:
B. 95
Explanation:
If you take the figure at face value, the exterior angle is obtuse. The only answer choice that matches is choice B.
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If you want to calculate the angle, you can make use of the fact that the exterior angle is equal to the sum of the opposite interior angles:
8x +15 = (4x +5) +(3x +20)
x = 10 . . . . . . . . . subtract 7x+15 and collect terms
Then the exterior angle is ...
8·10 +15 = 95