Question

In a quadrilateral ABCD, angle A+ angle C is 2 times angleB + angleD, if angle A = 40° then angle C =?
(A) 60°
(B) 80°
(C) 120°
(D) None of these
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Answer 1

Answer:

20

Step-by-step explanation:

40+x=2x+x

40=2x+x-x

40=2x

x=2÷40

x=20