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Easy Man
Step-by-step explanation:
SOQ is the addition of ROS and ROQ
so, QOS = ROS + QOR------------------1
ROQ=ROP (90)
POS+SOR=ROQ------------------------------------2
POS=QOR - ROS
SOR=POS
2 In 1 gives you
QOS=POS+ROS+ROS
2ROS=QOS-POS
Therefore ROS=(QOS-POS)/2
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