The level of fluid in the liter bags reads at the 700 mark. How much fluid has been given?

• A. 700 ml
• B. 700 L
• C. 300 L
• D. 300 ml

Answer: (D)

A 1-liter bag holds 1000 milliliters. The graduations show how much fluid remains in the bag, not how much has already been given. If the level is at the 700 mL mark, then 700 mL is still in the bag, and the amount delivered is 1000 mL minus 700 mL, which equals 300 mL. So 300 mL has been given. The other options either treat the 700 mL as the amount given or use incorrect units (liters) for a 1-liter bag.