∠Q + 3x+25 = 180
∠Q = 155 - 3x
∠R + 2x+30 = 180
∠R = 150 - 2x
155-3x + 150-2x + 75 = 180
305+75-5x = 180
61+15-x = 36
76 - x = 36
x = 40
∠PQR = 155 - 3x
= 155 - 120
∠PQR = 35°
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∠Q + 3x+25 = 180
∠Q = 155 - 3x
∠R + 2x+30 = 180
∠R = 150 - 2x
155-3x + 150-2x + 75 = 180
305+75-5x = 180
61+15-x = 36
76 - x = 36
x = 40
∠PQR = 155 - 3x
= 155 - 120
∠PQR = 35°