OK going into Egypt we have ~70 people after some 400 years we have ~600,000. Assuming that a generation was seventy years that gives 6 generations until 420 years have passed.
If 70 individuals translates into 35 married couples then we have 35 families. If each family has 11 children then that translates to 5.5 families replacing each i.e. 35 x 5.5 = 161 continue in like fashion for 6 generations and you arrive at 331,600 families. Multiply by two to find the number of individuals = 663,200.
So each family had roughly 11 children. Or can someone do the maths better?
-----Added 2/3/2009 at 08:57:24 EST-----
If you pastors ever wondered what your congregation was thinking Sunday morning this was it for 1st February