There were 55 people at a high school class reunion. If 16 people had college degrees, 12 people had college degrees and were married, and 14 people were single and did not have college degrees, how many people were married and did not have college degrees?

Draw a Venn diagram, that should help you a lot.

http://p1cture.me/images/59567519281826091082.png

See if you can understand that one. If you do, solve the problem and post what you get.