To find the cost \( c \) of each bag of lemons, you can use the equation that models the total cost. Since Julio bought 5 bags of lemons for a total of $19.75, you can express this as:
\[ c = \frac{19.75}{5} \]
So, the equation that models the cost of each bag of lemons is:
\[ c = \frac{19.75}{5} \]