Bunuel wrote:

In the figure above, x =

(A) 100

(B) 120

(C) 130

(D) 140

(E) 160

Attachment:

2017-08-08_2111.png

IMO B-120.

100 degrees = 40deg +(180-x)deg

x= 120 degrees.

Primary rule used : External angle of a triangle is equal to the sum of its two opposite internal angles.

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