A school has 6 fifth grade classes, with a mean class size of 24 students. Five of the classes had 20,27,25,28 and 21; what is the size of the remaining class?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50