The angles of the triangle measure X +10 X +20 and X +30 find the major of the smallest angle

70
40
50
60

The sum of the angles in a triangle is always 180 degrees.

Therefore, (X + 10) + (X + 20) + (X + 30) = 180
3X + 60 = 180
3X = 120
X = 40

So, the angles of the triangle are 50, 60, and 70. The smallest angle measures 50 degrees.

Therefore, the answer is:
50