A cafeteria has 6 round tables and 12 rectangular tables. Each round table has 5 chairs, and each rectangular table has 8 chairs. How many chairs are there in all?

There are five blue chairs and four pink chairs in a class of nine students, comprising five boys and four girls. Before lunch, the five boys sat on the blue chairs and the four girls sat on the pink chairs. If after lunch, no girl sat on the same chair on which she was sitting before lunch, but all the girls sat on pink chairs, in how many ways can all the students be seated?

Eighty-four people have been invited to a banquet. The caterer is arranging tables and each table canseat 12 people. How many tables does the caterer need to arrange?

George produces 10 tables per week and 20 chairs per week, Martha produces 4 tables and 12 chairs per week, what is the opportunity cost for George of tables in terms of chairs

Helen had to arrange some chairs in a fixed number of rows. If she put 8 chairs in each row, she would be short of 7 chairs. If she put 7 chairs in each row, she would have 2 chairs left. How many chairs were there?

In Leah's classroom there are red chairs, yellow chairs, and blue chairs. There are 8 red chairs. There are 4 times as many yellow chairs as red chairs, and there are 6 fewer blue chairs than yellow chairs. How many chairs are there in Leah's classroom?