Question 886161
Let x = measure of ∠A

Given that,
∠A = 3∠B + 25° and
∠A + ∠B = 165°

x = 3∠B + 25°
x + ∠B = 165°

Substituting,
(3∠B+25°)+∠B = 165°
4∠B+25° = 165°
4∠B = 165°-25°
4∠B = 140°
∠B = 35°

∠A + ∠B = 165°
∠A + 35° = 165°
∠A = 165°-35°
∠A =130°