Can anyone help me ASAP!!

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?

What are the excluded values? m+5/mn+3m