If you add two numbers together, their sum is 15. If you subtract the smaller number from the bigger one, the answer is 3. What is the smaller number?

Tina, Vanessa, and Julie deliver newspapers after school. Last week, Tina made $3 and Vanessa made $5. Together, Vanessa and Julie made $10 more than Tina. How much money did Julie make?

Roger has 12 marbles and David has 2 marbles. They want to have the same number of marbles. How many marbles should Roger give to David so both boys have the same number of marbles?

There are 9 boys and 6 girls in the second grade class. 2 boys and 3 girls are out sick today. How many more boys than girls are in class today?

I have a number machine that adds 6, subtracts 2, and then adds 9. If I give my machine the number 5, what number will come out?