Question

What is the value of x?
30
45
55
60

Answer 1

x + 3x = 180 ( because angles on a straight line are supplementary - that is they add up to 180 degrees)


4x = 180

x = 45 degrees

Answer 2

x +3x = 180

4x = 180

x = 180/4 = 45

x = 45