To model the cost \( c \) of each bag of lemons, you can use the following equation:
\[ c = \frac{t}{n} \]
where:
- \( t \) is the total cost of the lemons,
- \( n \) is the number of bags.
In this case, Julio bought 5 bags for a total of $19.75. Plugging in these values:
\[ c = \frac{19.75}{5} \]
So, the equation that models the cost of each bag of lemons is:
\[ c = \frac{19.75}{5} \]