Question

29. There are two buildings P and Q. If 15
persons are sent from P to Q, then the
number of persons in each building is the
same. If 20 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 ?
(a) 140
(b) 90
(c) 80
(d)
120​

Answer 1

Answer:

120

(Taking P as x and Q as y)