Answer:
QR = 6
Explanation:
RO=8, SP=20, and QS=15
QS/SP = QR/RO ==> solve for QR
15/20 = QR/8 ==> plugin known values
8 * 15/20 = 8 * QR/8 ==> multiply 8 on both sides to isolate QR
120/20 = QR ==> simplify
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