On what do you base that statement? I'm not flame baiting here, I would like to know if you have a basis for saying that the numbers do not add up.
In 1939, there were nearly 15,700,000 Jews in the world. After the Second World War that number had risen to over 18,000,000 Jews. What this means is that of the 15,000,000 original Jews on the planet, 6,000,000 were gassed, leaving only some 9,000,000-plus. Then, the world Jewish population rebounded and doubled to over 18,000,000 in less than nine years.
And here's a link if youd like to see more from that
Invalid Link Removed I admit thats not the best page, but it gives a decent overview