Help finding the smallest angle in a triangle.

[Angelwngs20]

I need help with this question because I am horrible in math and I am doing a practice test online for the ASVAB because i'm trying to join the ARMY and I don't understand any of their Algebra type questions on the practice test...here is the question. :?

The three angles of a triangle are 3x, x + 10, and 2x - 40. Find the size of the smallest angle in the triangle?

 

[galactus]

The angles of a triangle add up to 180.

Add them up, set equal to 180 and solve for x.

\(\displaystyle 3x+(x+10)+(2x-40)=180\)

solve for x. Plug your x value just found back into the 3 expressions they gave and see which is smallest