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# If someone has 8 pints of blood and donates 470ml. What fraction of his blood is this Watch

1. A 70kg patient has approximately 8 pints of blood. The patient donates 470mL of blood. Approximately what fraction of his body’s blood is this? (one pint = 568mL)
2. (Original post by Sam00)
A 70kg patient has approximately 8 pints of blood. The patient donates 470mL of blood. Approximately what fraction of his body’s blood is this? (one pint = 568mL)
Well you need to be dealing with the numbers in the same units, so it would make sense to use mL, given what information you have been told.

You know there are 8 pints, so:

8 x 568mL = 4544mL.

Then you want the fraction of all of the blood in the body that was donated which is simply:

470/4544 = 235/2272 (simplified)

(It is approximately one tenth)

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3. Well, 8x568 = 4544ml, so 470 / 4544 = ?
4. 8 Pints = 4,546.09188ml

470 / 4,546.09188 = Roughly 235/2272 but is not exactly, depends of how accurate you want to be
5. That's very nearly an armful

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