In ΔABC, ∠A + ∠B = 65°, ∠B + ∠C = 140°, then find ∠B.

Answer: Option B

According to question,

Given :
∠A + ∠B = 65°
∠B + ∠C = 140°
We know that
∠A + ∠B + ∠C = 180°
∠C = 180° - (∠A + ∠B)
∠C = 180° - 65°
∠C = 115°
∠B = 140° - 115°
∠B = 25°