# How many persons are there in building P?

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There are two buildings P and Q.
If 75 persons are sent from P to Q, then the number of persons in each building is the same.
If 105 persons are sent from Q to P, then the number of persons in P is double the number of persons in Q.
How many persons are there in building P?

posted Dec 3, 2018

465 & 615

P-75=Q+75 -> P=Q+150
(Q-105)*2=P+105 -> 2Q-210=Q+150+105 -> Q=465 , P=615

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