Hi there!
The angle that is 1/3 of a right angle is 30°, because a right angle is 90°.
90 ÷ 3 = 30
The greater angle exceeds (is greater than) the lesser angle by 80°, which is 30°, so that means it must be 110°.
30 + 80 = 110
All interior angles of a triangle add up to 180°, so that means the last angle must be 40°, because we already have 140°.
30 + 110 = 140
180 - 140 = 40
Angles of the triangle: 30°, 40°, 110°
Hope this helps!