3+4+1 for each class so it's 8
8 x 6 for all the classrooms so it's 48. The school buys 48 games
Work: 5,5,5,10,20
Add
5+5+5+10+20
10+5+10+20
15+10+20
25+20
45
÷ by the amount of numbers
45÷5=9
Ansser: mean=9
Http://mathsfirst.massey.ac.nz/Algebra/SystemsofLinEq/EMeth.htm this website explains it well
B. D=0.25n + 25
D=total n=number of hours 0.25=price per hour 25=the one time fee
