Question 40301
Well if 1 cubic mm of blood has 4,500,000 cells, then .25 cubic mm would have 1/4 of that or 1,125,000 cells.  Now if that solution is diluted 1:300, you would expect 1/300 of the normal number of cells in the saline solution, thus...
(1/300)(1,125,000) =
3750 cells