Bunuel wrote:
In the figure above, (a + b + c)/(s + t + u) =
(A) 1/3
(B) 1/2
(C) 2/3
(D) 1
(E) 3/2
Attachment:
2017-08-12_1405.png
Interior angles sum to 180
a + b + c = 180
Exterior angles sum to 360
s + t + u = 360
(a + b + c)/(s + t + u) = 180/380
\(\frac{180}{360}\) = \(\frac{1}{2}\)
OR (exterior angle = sum of two non-adjacent angles)
b + c = s
a + c = t
a + b = u
b + c + a + c + a + b = s + t + u
2(a + b + c) = (s + t + u)
2(a + b + c)/(s + t + u) = 1
(a + b + c)/(s + t + u) = 1/2
Answer B
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