Initial Public Offering question

Can someone help me with the following question? I have the solution, but I do not understand it. Help much appreciated, cheers

--------------------------------------… Playtech is a designer, developer, and licensor of software for the gambling industry. On 28 March 2006, Playtech raised approximately $265 million gross through an initial public offering of 103,142,466 ordinary shares at $2.57 per ordinary share. After the initial public offering, Playtech had 213,333,333 ordinary shares issued and outstanding. Playtech received gross proceeds of approximately $34.3 million and net proceeds of $31.8 million. The ordinary shares that were sold to the public represented approximately 48 percent of Playtech’s total issued ordinary shares.

Q) Approximately how many new shares were issued by the company and how many shares were sold by the company’s founders? What fraction of their holdings in the company did the founders sell?

S) Playtech received gross proceeds of $34.3 million at $2.57 per share so the company issued and sold 13,346,304 shares (= $34.3 million/$2.57 per share). The total placement was for 103,142,466 shares, so the founders sold 89,796,162 shares (=103,142,466 shares - 13,346,304 shares). Because approximately 200 million = 213.3 million - 13.3 million shares were outstanding before the placement, the founders sold approximately 45 percent (= 90 million/200 million) of the company.

--------------------------------------…

The thing I don't understand are: 1) Why do we divide 90 mill/200 mill to get how much the founders sold? Why not 90 mill/213 mill? 2) Why doesn't all the gross profit of the IPO go to the founders? How do we actually decide how much does Playtech receive? Aren't the founders the owners of the company, so shouldn't they receive all the cash from the IPO?

As you can see I am really new at finance, so any help will be much appreciated!!!

BTW, this question is out of CFA Level I study guides.