2x = 3x - 50 alternate angle
50∘^{\circ}∘ = 3x - 2x
50∘^{\circ}∘ = x
< NPQ = (3x - 50)∘^{\circ}∘
= 3(50)∘^{\circ}∘ - 50
= 150 - 50 = 100∘^{\circ}∘
