4students is 20% of 20 students is it correct

Given the following statements, which is the best

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)

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?