A coffee mug has a capacity of 16 fluid ounces. If Annie needs to fill 26 mugs with coffee, how many quarts of coffee does she need?

A pint is a pound (16 ounces) the world around.

2 pints are a quart
so
a quart is 2 pounds or 2 mugs
so
26 mugs * 1 quart / 2 mugs = 13 quarts
( those are seriously big mugs. A cup is half that size)