Finding angles of a triangle

Question

one angle of a triangle is 5 times the smallest angle. The third angle is 40 degrees. What are the measure of all three angles?

Answer 1

let A be the smallest angle.

The 2 other angles are 5A and 40

The sum of all three angles must be 180, so:

A + 5A + 40 = 180

Simplify this and solve for A