A liter bag is marked at 700 mL; how much more fluid is needed to reach 1 liter?

A liter bag is marked at 700 mL; how much more fluid is needed to reach 1 liter?

• A. 100 mL
• B. 300 mL
• C. 700 mL
• D. 1,000 mL

Answer: (B)

To reach 1 liter, you subtract the current amount from the target. Since 1 liter equals 1000 mL, and the bag has 700 mL, you need 1000 − 700 = 300 mL more. So add 300 mL to bring the total to 1 liter (0.3 liters). This kind of calculation is basic volume math you’ll use often in fluid therapy to ensure the exact desired volume is reached. Adding 100 mL would only reach 800 mL, while adding 700 mL or 1000 mL would overshoot well beyond 1 liter.

To reach 1 liter, you subtract the current amount from the target. Since 1 liter equals 1000 mL, and the bag has 700 mL, you need 1000 − 700 = 300 mL more. So add 300 mL to bring the total to 1 liter (0.3 liters). This kind of calculation is basic volume math you’ll use often in fluid therapy to ensure the exact desired volume is reached. Adding 100 mL would only reach 800 mL, while adding 700 mL or 1000 mL would overshoot well beyond 1 liter.