Four rooms in 88 yuan, three rooms in 68 yuan, a double room for one day and 48 yuan for one day.

If you live in an ordinary triple room with X rooms, you will live in an ordinary double room (50-3x)/2 rooms.

150 x+ 140(50-3x)/2 = 15 10 * 2

150 x+3500-2 10x = 3020

60x=480

x=8

(50-3x)/2=(50-3*8)/2= 13

A: We have eight triple rooms, 13 double rooms.