A soup kitchen had 4 1/2 gallons of soup at the start of the day. They had 2 gallons of soup left by the end of the day. How many gallons of soup did they use during the day? (subtract)
a. 4 1/2 - 2 = 2 1/2 gallons
b. 4 1/2 - 2 = 4 1/2 gallons
c. 4 1/10 - 2 = 2 1/10 gallons
d. 4 1/10 - 2 = 4 1/10 gallons
