Question

An angle is 40° less than three times its supplement. Find the angles. ​

Answer 1

Let its supplement be x.

Angle 1 = x

Angle 2 = 3x-40

The sum of supplementary angles is 180 degrees. Therefore -

x+3x-40=180

4x-40=180

4x=180+40

4x=220

x=220/4

x=55

Angle 1=x

           =55 degrees

Angle 2=3x-40

            =3*55-40

            =165-40

            =125