Problem Solving (PS) | Re: There were P people in a room when a meeting started. Q people left th

-P # of people in the room at the very start
-Then q leave, (P-Q)
-At the same time R people enter (P-Q+R), which is our numerator.
-Denominator is # of people in the room since the meeting began which is P-Q
-So the number is [P-Q+R][/P-Q]*100
-B

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