Question

two adjacent angles are in the ratio 5:3 and they together form an angle of 120 fund the angle

Answer 1

5x+3x=120
8x=120
x=15

5x=5*15=75
3x=3*15=45

Answer 2

here your answer
let the common ratio be x
5x+3x=120
8x=120
x=120/8
x=15
one angle is 15×5=75
and another is 3×15=45
hope it helps.