Final answer:
Juan and Xie used a total of 3/4 gallon of paint on the first day. After the first day, there were 24 1/4 gallons of paint left.
Step-by-step explanation:
To find out how many gallons of paint were left after the first day, we need to subtract the amount of paint used by Juan and Xie from the total amount of paint they started with.
Given that Juan used 1/2 gallon and Xie used 1/4 gallon of paint, the total amount of paint used on the first day is 1/2 + 1/4 = 3/4 gallon.
To find out how many gallons of paint were left, we subtract 3/4 gallon from the starting amount of 5 5-gallon cans: 5 * 5 - 3/4 = 25 - 3/4 = 24 1/4 gallons.