Answer:
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.
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