Here's the code I have and here's the system of equation it creates which is not working as desired. Do you know how I can fix it?

```
\item For what value of $b$ would the following system fo equations have an infinite number of solutions?\hfill
$$\begin{align*} 
3x+5y &=  27 \\ 
12x+20y &=  3b
\end{align*}$$
    \begin{enumerate}
    \item $9$   
    \item $27$ 
    \item $36$
    \item $81$ 
    \item $126$             
    \end{enumerate}

```

![enter image description here](https://i.stack.imgur.com/PHja2.png)