Bunuel wrote:

In the figure, what is the value of y ?

(A) 7.5

(B) 15

(C) 30

(D) 40

(E) 45

Attachment:

2017-06-21_1251.png

In a triangle, Exterior angle = Sum of interior angles

y + 30 = (y - 15) + (y + 15)

-> y = 30

Answer C

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