A gasoline tank holds 3 3/4 gallons. If 1/3 of the tank has been used, then how many gallons have been used?

Answer

3.75 gallons

Q: What fraction of the tank is 1/3? A: 1/3 is equal to (3/4) x (1/3) = 1/4.
Q: How many gallons have been used if 1/4 of the 3 3/4 gallons has been used? A: 1/4 x 3 3/4 = 15/4 = 3.75.