Question 12075
let the smallest angle = X
Middle angle = X+10
Largest Angle= X+50

Sum of all angles in a trianle = 180
So
X + X+10 + X+50 = 180
3X+60 = 180
3X = 180-60 = 120
3X = 120
X = 120/3 = 40degrees
Middle angle = 40+10  = 50
Largest angle = 40+50 = 90