The difference between two consecutive angles is 10°
Let x, x + 10°, x + 20° be the consecutive angles
x + x + 10° + x + 20° = 180°
3x + 30° = 180°
3x = 180° - 30°
3x = 150°
or x = 50°
Again,
x + 10° = 50° + 10° = 60°
x + 20° = 50° + 20° = 70°
Answer: Three angles are 50°, 60° and 70°.