Perhatikan gambar berikut​

<PQS + <SQT + <TQR = 180°

3x + 90° + 2x + 10° = 180°

5x + 100° = 180°

5x = 80°

x = 16°

…

<PQS = 3x = 3 x 16° =48°

Jadi jawabannya B

maaf bila ada kesalahan

3x+2x+10=90
5x=90-10
5x=80
x=16
sudut PQS = 3x = 3×16=48