Define odds as: odds=p/(1-p). Can you define p in terms of odds?
If you couldn't solve it, don't feel dejected. That's a problem that can be fixed, and besides, I know a lot of people who are in the same boat as you. Our book is not designed to fix this problem (that would require more contact with mathematics, which is up to you), but our bookis designed to teach a little bit to people who're at this level.
PS You may benefit from the book even if you could solve the above problem. Just take a look and decide for yourself.