Question

Marissa bought 2 and 1/2 gallons of orange juice to make punch how many quarts of orange juice did Marissa Buy

Answer 1

4 because 2 1/2 gallons equals 1 Gallon and 1 Gallon equals 4 quarts

Answer 2

1 gallon = 4 quarts
using this information, you can then use simple proportion.
if 1 gallon = 4 quarts
then to find the amount of quarts in 2 and 1/2 gallons, you multiply 2 and 1/2 by 4 which should give you 10 gallons