To find the cost per bag of lemons, you can use the equation:
\[ c = \frac{19.75}{5} \]
Where:
- \( c \) is the cost of each bag of lemons,
- $19.75 is the total cost for the 5 bags, and
- 5 is the number of bags.
So the complete equation that models the cost of each bag of lemons is:
\[ c = \frac{19.75}{5} \]