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Mathematics
Problem
Quadrilateral ABCD has an exterior angle at vertex A measuring
140
∘
140^{\circ}
14
0
∘
. The interior angle at vertex C is
(
4
y
−
20
)
∘
(4y-20)^{\circ}
(
4
y
−
20
)
∘
. For what value of
y
y
y
will ABCD be a parallelogram? a)
10
10
10
b)
15
15
15
c)
20
20
20
d)
40
40
40
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