12. Linda was selling tickets for the school play. She sold 10 more adult tickets than children’s tickets, and she sold twice as many senior tickets as children’s tickets.
Let x represent the number of children’s tickets sold.
(i) Write an expression to represent the number of adult tickets sold.
(ii) Write an expression to represent the number of senior tickets sold.
13. A cupboard contains x plates, y bowls, and z cups.
Write algebraic expressions for each of the following.
(i) The total number of plates, bowls and cups
(ii) The total number of plates and bowls
(iii) The number of cups in the cupboard after 3 cups are taken out
(iv) The number of cups in the cupboard after 5 cups are added to it.
14. Let m represent the amount of money (€) in a money box on a particular day. Write an algebraic expression for the amount of money in the money box for each of the following (as separate events).
(i) €1·50 is added to the box (ii) €5·25 is taken out of the box (iii) € b is added to the box (iv) € t is taken out of the box
(v) The amount of money in the box is doubled
15. The sum of two expressions is equal to 7x + 12 . Find three possible pairs of expressions, where the sum of the pairs is equal to 7x + 12 .