Question

there are about 25000000000 red boold cells in the average adult. About how many adult would it take to have a total googol of red blood cells?

Answer 1

A googol is 1.0*10^100.  there are 25000000000 RBC in the average adult.  
The number of adults equals
1.0*10^100 / 25000000000
=400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
(=10^100/(25*10^9)=4*10^89)