Answer
There are 2.65$\times$$10^{11}$ white blood cells in a 140 pound human body.
Work Step by Step
To solve this we will use dimensional analysis
140 lb $\times$ $\frac{2.7\times10^{4}microliter}{1 lb}$ $\times$ $\frac{7\times10^{4} whitebloodcells}{1 micro liter}$ = 2.65$\times$$10^{11}$ white blood cells
