To model the cost \( c \) of each bag of lemons, you can use the following equation:
\[ c = \frac{19.75}{5} \]
This equation represents that the total cost of 5 bags of lemons ($19.75) is divided by the number of bags (5) to find the cost per bag.
Now, if you perform the division:
\[ c = 3.95 \]
So, each bag of lemons costs $3.95.
The complete equation is:
\[ c = \frac{19.75}{5} \text{ or } c = 3.95 \]