Question

find the Supplementary angle whose one angle is twice the other

Answer 1

let the one angle be 'x'

other angle = twice of x = 2x

sum of supplementary angles = 180°

x + 2x = 180°


3x = 180°


x = 60°

Answer: required angle = 60°

Answer 2

Let the first angle be "x"
Another angle be "2x"
x+2x=180
3x=180
x=180/3
x=60.
2x=60×2
120