To convert quarts to gallons, divide the number of quarts by 4 because there are 4 quarts in a gallon.
2.5 quarts = 2.5/4 = 0.625 gallons
The family uses 0.625 gallons of milk per day, and in 75 days, they will use 0.625 x 75 = <<0.625*75=46.875>>46.875 gallons. Answer: \boxed{46.875}.
A family uses 2.5 quarts of milk per day. How many gallons of milk does the family use in 75 days
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