Final answer:
There are 52 dirty coffee mugs at Dan's Pancake House.
Step-by-step explanation:
In order to determine the number of dirty coffee mugs at Dan's Pancake House, we first need to find 80% of 65. To do this, we can multiply 65 by 0.8, which gives us 52.
Therefore, there are 52 dirty coffee mugs at the pancake house.
Learn more about Dirty coffee mugs