Question 275997
The second angle of a triangle is 4 times as large as the first. The third angle is 80° more than the sum of the other two angles. Find the measure of the second angle. 

let one angle be x

the second angle will be 4x

The third angle will be 80 more than (x+4x)

= x+4x+80

The sum of the angles of the triangle = 180 deg

x+4x+x+4x+80=180

10x=180-80
10x=100
x=10 first angle

Second angle is 40

Third angle is 130 deg.