12 less than 1 eleventh of some number w

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?

The triangles are similar. what is the value of x? enter your answer in the box.

Ineed to know how to write question one in mathematical terms