To model the cost, \( c \), of each bag of lemons, you can set up the equation based on the total cost of the lemons. If Julio bought 5 bags of lemons for a total of $19.75, the equation can be written as:
\[ 5c = 19.75 \]
To find the cost of each bag of lemons (\( c \)), you can solve for \( c \) by dividing both sides of the equation by 5:
\[ c = \frac{19.75}{5} \]
So the completed equation that models the cost of each bag of lemons is:
\[ 5c = 19.75 \]