There are 21 boys and 7 girls in your gym class. your teacher selects 2 students at random to be team leaders for a game. what is the probability that both students are girls?

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?