40°, 60°, 80°

Let the angles of triangle are 2a, 3a and 4a.

Therefore,

2a + 3a + 4a = 180°[Sum of angles]

⇒ 9a = 180°

⇒ a = 20°

Angles of triangle are,

2a = 2 × 20° = 40°

3a = 3 × 20° = 60°

4a = 4 × 20° = 80°