Question

find the measure of an angle if its supplement measures 20 degrees less than 3 times its complemement.

A) 156,  B)17,  C)35,  D)78

Answer 1

180 - x = 3(90 - x) - 20

180 - x = 270 - 3x - 20

180 - x = 250 - 3x

2x = 70

x = 70/2 = 35 degrees