Choose one of the problems below and type a complete solution using Polya's four-step problem solving process.

Polya's four-step process is described in chapter 1 in your text. Simply put, it is:

1. Understand
2. Devise a plan
3. Carry out the plan
4. State the answer and look back

You may discuss this assignment with others in the class, but you are not allowed to receive any additional help. Each person is to complete their own write-up.

Problem A: Carmela opened her piggy bank and found she had $15.30. If she had only nickels, dimes, quarters, and half-dollars and an equal number of coins of each kind, how many coins in all did she have?