A student usually saves $25 a month. He would like to reach a goal of saving $400 in 12 months. The student writes the equation 400 = 12(x + 25) to represent this situation. Solve the equation for x.

To receive full credit you must do the following:
1. Show your work or explain how you arrived at the solution.
2. Write your answer as a sentence that describes what the variable x represents