Online music sharing

Regina spent $45.50 over 6 1/2 months on music downloads.
If she spent the same amount each month, how much did Regina spend per month on music downloads?
Choose the equation that can be used to represent the situation.

Correct answer:

x =  7 USD

Step-by-step explanation:

$$\begin{gathered} a=45.50\text{USD} \\ m=6\frac{1}{2}=6+\frac{1}{2}=\frac{6\cdot 2+1}{2}=\frac{12+1}{2}=\frac{13}{2}=6.5 \\ x=a/m=45.5/6.5=7\text{USD} \end{gathered}$$

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