Someone help me solve for x.

Which of these choices show a pair of equivalent expressions?

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?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount