# By these calculations what is the volume of one drop of blood?

So the average amount of blood in an adult is 5000mL. There are 35 000 000 000 000 (35 trillion) red blood cells in 5000mL of blood. If there is 250 000 000 red blood cells in one drop of blood, what is the volume of one drop of blood?

Update:

Also I'm pretty sure it's wrong but my first attempt was 0.00357142857142857 but I'm sure it's wrong.

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- kumorifoxLv 78 years agoFavourite answer
You divide 35,000,000,000,000 by 250,000,000 to get the number of drops per 5,000 mL. Then divide 5,000 by that value to get the volume of 1 drop in mL.

3.5×10^13/2.5×10^8 = 140,000 drops per 5,000 mL

5,000/140,000 = 0.0357 mL/drop.

You were out by 1 decimal place, but the numerical value is correct.

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