I don't understand this math problem someone who could help me understand this problem thanks

Question

The flag of a country contains an isosceles triangle.​ (Recall that an isosceles triangle contains two angles with the same​ measure.) If the measure of the third angle of the triangle is

25​° more than three times the measure of either of the other two​ angles, find the measure of each angle of the triangle.​ (Recall that the sum of the measures of the angles of a triangle is​ 180°.)

The first angle is

the second angle is

and the third angle is

Answer 1

C +A +B = 180(

(25 +3A) +A+B = 180

A=B

25 + 3A +A+A = 180

5A = 180-25 = 155

A = 155/5 = 31

A = 31 degrees = 1st angle

B=A = 31 degrees = 2nd angle

C = 180=62 = 118 degrees = 3rd angle

3rd angle = 25 +3(31) = 25+93 = 118