Question 500867
Let x be the complementary angle and y be the supplementary angle.

y = 3x + 20   -> equation 1

sum of complementary and suppliemary angle is 180 degrees
x+y=180

substituting equation 1 in the above,

x + 3x + 20 = 180
4x = 160
=>x = 40 degress
  y = 3x + 20 = 120 + 20 = 140 degress

Copmplemenary angle = 40 degress 
Supplementary angle = 140 degrees