A human being has about 2.5 X 10(to the 13th power) red blood cells in her bloodstream. There are about 2 white blood cells for every 1,000 red blood cells. How many white blood cells are in a human's bloodstream?
Please show your answer in scientific and standard notation.
Since there are about 2 white blood cells for every 1,000 (or 10 to the 3th power) red blood ...
This uses ratios and scientific notation to solve a word problem.