1. How many numbers between 100 and 500 end in a 5?

2. The sum of 4 consecutive (in a row) numbers is 50. What is the smallest of these numbers?

3. The members of a girls' volleyball team have numbers from 1 through 20. They line up in numeric order and then the ends of the line move around until they meet, forming a circle. What is the number of the girl across from girl number 7?

4. Andre buys 2 books at a book fair. The second book cost $2 more than the first book. Together they cost $6. How much did Andre's first book cost?

5. What is the greatest common factor of 51 and 85?