Question

What is the value of x?

A. 56
B. 78
C. 12
D. 24

Answer 1

x + x + 24 = 180
2x = 156
x = 78

answer
B. 78

Answer 2

x = 78, because
1) The last angle (the one without the X, equals 24 degrees)
2) 180 - 24 = 156
3) 156/2 = x
x = 78

hope this helps