1. A soccer ball and a jersey together cost $32. If you buy 2 soccer balls and 3 jerseys, the total cost is $86. What does 1 soccer ball cost? What does 1 jersey cost?

2. As winter approaches, chipmunks begin to gather nuts. The average chipmunk gathers 32 nutshells in 3 days. Unfortunately, 1 out of every 8 nutshells is hollow and does not contain a nut. How many nuts can 3 chipmunks expect to gather in 2 weeks, assuming that 1 out of very 8 nutshells is empty?

3. One-fifth of the fence posts around Will's house are oak, and the rest are pine. Will places reflectors on 1/3 of the pine fence posts. If 231 fence posts in Will's yard do not have reflectors, how many are oak?

4. Brooke makes $2 an hour more than Nicholas. Nicholas makes $3 an hour less than Mac. If Brooke, Nicholas, and Mac work together for 6 hours and are paid $147, how much does each person earn per hour?

5. Mac's salary is based on the number of students he has. Suppose a salary of $60 a month was to be paid for 50 students and $50 a month for 30 students. If the actual enrollment was 45 students, what should Mac be paid?

6. Thor is 5 years old. His mother is 28. How old will Thor be when he is exactly half as old as his mother?