1) x + 50 = 180
x = 130
x = AOB
2)x + 20 + x = 180
2x = 160
x = 80
3)X + 4X = 180
5X = 180
X = 36
4X = 144
4x = AOB
4)3X + 2X = 180
3*36 = 108
108 = AOB
5)BOC = AOB-30
AOB = X
x-30 + x = 180
2x = 150
x = 75
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Answers & Comments
1) x + 50 = 180
x = 130
x = AOB
2)x + 20 + x = 180
2x = 160
x = 80
x = AOB
3)X + 4X = 180
5X = 180
X = 36
4X = 144
4x = AOB
4)3X + 2X = 180
5X = 180
X = 36
3*36 = 108
108 = AOB
5)BOC = AOB-30
AOB = X
x-30 + x = 180
2x = 150
x = 75
x = AOB