Question

the sum of an angle and 1/3 of its supplementary angle is 90. the measure of angle is
a) 135
b) 120
c) 60
d) 45

Answer 1

Here it is...
x = (1/3)(180-x)
x = 60 - (1/3)x
(4/3)x = 60
(1/3)x = 15
x = 45