In an introductory blood donation context, if 1 vial contains 10 mL of blood and $1 \mathrm{pint}=473 \mathrm{mL}$, approximately how many pints of blood are in 7 vials?

• A. About $2.1$ pints
• B. About $1.5$ pints
• C. About $0.15$ pints
• D. About $0.47$ pints

Answer: (C)

Verified step by step guidance

1. First, determine the total volume of blood in all 7 vials by multiplying the volume of one vial by the number of vials: \(7 \times 10\, \text{mL}\).
2. Next, calculate the total volume in milliliters: \(7 \times 10 = 70\, \text{mL}\).
3. Recall the conversion factor given: \(1\, \text{pint} = 473\, \text{mL}\).
4. To find the volume in pints, divide the total volume in milliliters by the number of milliliters per pint: \(\frac{70}{473}\).
5. This fraction will give you the approximate number of pints contained in 7 vials of blood.