Question 792256
angle 1 = x
angle 2 = 3x
angle 3 = x + 40

angles 1 + 2 + 3 = 180
x + 3x + (x + 40) = 180
5x + 40 = 180
5x + 40 -40 = 180 - 40
5x = 140
5x/5 = 140/5
x = 28

check:
28 + 3(28) + (28 + 40) = 180
28 + 84 + 68 = 180
180 = 180