Question 521225

let x be that angle, y its supplement and z its complement.
 y= 180 - x    and z= 90 - x

the supplement of x is three times its complement, so y=3z
 180 - x = 3( 90 - x)
180 - x = 270 - 3x
  - x + 3x= 270 -180
  2x= 90
x=45.

so the answer is 45.