Question

urgent plz give answer in full method

Answer 1

x+x-20+x-40=180(angle sum property of a triangle)
3x-60=180
3x=180+60
3x=240
x=240/30
x=80
x-20=(80-20)=60
x-40=(80-40)=40

Answer 2

x+(x-20)+(x-40)= 180   [angle sum property]
=> 3x - 60 = 180
=> 3x = 240
=> x = 240/3
=> x = 80
ans-- 1angle =x=80
         2ang = 80-20=60
         3 angle = 80-40= 40