Question 66516
first angle =x, the second is 5x & the third angle is 180-120=60
so x+5x+60=180
6x=180-60
6x=120
x=120/6
x=20 the 3 angles are 20, 100 & 60.
proof
20+5*20+60=180
20+100+60=180
180=180