math
posted by Amy on .
A group of tourists stay in a hotel. If 6 tourists stay in each room, there will be an extra 9 beds. If 3 tourists stay in each room, they will need another 4 rooms. How many tourists are there in the group?

If there are t tourists and r rooms,
t = 6r9
t = 3(r+4)
6r9 = 3r+12
3r = 21
r = 7
so, t=33