Yuri O. answered • 02/18/21

16 years online, 464 former SAT problems drilled down

Let "x" be measure of the smallest angle in the triangle.

x → the measure of the smallest angle

(x + 15) → the measure of the 2nd angle in the triangle

3x → the measure of the largest angle in the triangle

Sum of angles' measures in a triangle is 180º.

Writing an equation:

x + (x +15) + 3x = 180

5x + 15 = 180

5x = 165

**x = 33º**

Calculating "x +3":

**x + 15** = 33 + 15 = **48º**

Calculating "3x":

**3x** = 3 • 33 = **99°**

Checking:

33 + 48 + 99 = 180

180 = 180 ← works out!