1. Will bought 9 ice-cream cones costing 11 dollars and x cents for his friends. If he had bought 13 cones at the same price, the cost would have been 15 dollars and y cents. Find x and y, the cents parts of the costs for 9 and 13 cones.

4. A horse and a mule were traveling together laden with bags of golden trinkets. After a time, the mule complained to the horse that his load was too heavy. "What's the matter?" said the horse. "You shouldn't complain, for had I taken one of your bags I would have had to carry twice as many bags as you. On the other hand, if you agreed to take one of mine, we'd have the same number of bags." How many bags did each have?

3. The quotient of the product and sum of 3 consecutive prime numbers is equal to the largest of the 3 consecutive prime numbers. What are the 3 numbers?

2. At her apple stand, Isa had to discard 1/4 of her apples because of rot. Of those remaining, someone bought 10 percent and another person bought 2.5 dozen. A delivery of fresh apples then quadrupled her remaining supply. She ended the morning with 744 apples. How many apples did she start with?

5. Think of any number, multiply it by 2, then add 4, multiply by 3, divide by 6, subtract the number you started with, and the result will be 2. Explain why this works.