Convert quarts into cups so we have a constant unit for the question.
There are 4 cups in a quart. Multiply the amount of quarts by the amount of cups in a quart:

Kayla has a 80-cup jug.
Each cup holds 2 and 3/4 cups. Convert this mixed number into an improper fraction:




Divide the amount of cups in the jug by the amount of cups that a cup can hold:

The jug can fill 320/11 cups.
Simplify this improper fraction by using remainder division:

Kayla can fill 29 cups with her 20-quart jug.