Question

If two complementary angles are in the ratio 2:5,find them

Answer 1

let angles be 2x and 5x
2x +5x+80=180
7x = 180-80
7x = 100
x=100/7
so
2x =2*100/7=200/7
5x=5*100/7=500/7

Answer 2

x =40 y=60 because x+y+80=180