Dear student.
For 1)
For the second one.
Let the common multiple be x
So the angles are 4x : 2x : 3x
We know that the angles in triangle add upto 180.
4x + 3x + 2x = 180
9x = 180
x = 180/9 = 20
So 4x = 4 x 20 = 80
3x = 3 x 20 = 60
2x = 2 x 20 = 40
Angles of the triangle are 80, 40, 60 respectively
Regards,