Compare the car types using the median and mean

What is this inequality notation? t is less then or equal to 2

Twelve less than a number is at most 20

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?