Population growth

How many people will be on Earth from two people for 5,000 years, if every couple has always 4 children, (2 boys and 2 girls) at the age of 25-35, and every man will live 75 years?

Correct result:

s =  4.82081413278E+60

Solution:

n0=2 n35=n0+1 4=2+1 4=6 n75=n352+2 4=62+2 4=12 n100=n754+4 4=124+4 4=24  a1=n35=6 a2=n75=12 a3=n100=24 q=a2/a1=12/6=2 q=a3/a2  n=5000/251=199  s=a1 qn=6 2199=4.820814132781060



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