Find the measurement of the angle and its supplement

Question

The ratio of the measurement of an angle to its supplement is 3:5. Find the measurement of the angle and its supplement

Answer 1

A/(180-A) = 3/5

cross ,multiply

5A = 540-3A

8A = 540

A = 540/8 = 67.5 degrees = the Angle

supplementary angle = 180-67.5 = 112.5 degrees

67.5/112.5 = 3/5