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The angle in a straight line always sums up to 180.

So, x+y+30 = 180
x+y = 150(Option C)
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Bunuel

Three lines intersect in the figure above. What is the value of x + y?

(A) 170
(B) 160
(C) 150
(D) 140
(E) 120


Attachment:
2017-07-19_1351.png

Angle along a straight line = 180 deg

Now x+ y + 30 = 180
So, x+y = 150


Answer C
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