Miriam makes 2 1 / 4 gallons of punch for a school event. How many 4 - ounce servings of punch can she serve?

She can serve 80 4-oz servings.

1 gallon = 4 quarts

1 quart = 2 pints

1 pint = 16 ounces

1 quart = 2 pints = 2 (16) = 32 ounces

1 gallon = 4 quarts = 4 (32) = 128 ounces

2 1/2 gallons = 2.5 (128) = 320 ounces

320 ounces/4 ounces per serving = 80 servings.