The World's Billionaires

Columns: No | Name | Net worth ( USD ) | Age | Nationality | Source ( s ) of wealth
1 | Bill Gates | $ 56.0 billion | 51 | United States | Microsoft | 2 | Warren Buffett | $ 52.0 billion | 76 | United States | Berkshire Hathaway | 3 | Carlos Slim | $ 49.0 billion | 67 | Mexico | América Móvil , Grupo Carso | 4 | Ingvar Kamprad | $ 33.0 billion | 80 | Sweden | IKEA | 5 | Lakshmi Mittal | $ 32.0 billion | 56 | India | Arcelor Mittal | 6 | Sheldon Adelson | $ 26.5 billion | 73 | United States | Las Vegas Sands | 7 | Bernard Arnault | $ 26.0 billion | 58 | France | LVMH | 8 | Amancio Ortega | $ 24.0 billion | 71 | Spain | Inditex Group | 9 | Li Ka-shing | $ 23.0 billion | 78 | Hong Kong | Cheung Kong Holdings , Hutchison Whampoa | 10 | David Thomson | $ 22.0 billion | 49 | Canada | Thomson Corporation

Example questions:
The 2007 world 's billionaire with the highest net worth owns a company that was ranked which number in the 2008 Fortune 500 ? | In what year did the 2007 world 's billionaire with the 4th highest net worth die in ? | What is the total population for the home country of the 2007 world 's billionaire who was 80 years old ? | The 2007 world 's billionaire with the lowest net worth inherited what name from their father ? | The 2007 world 's billionaire with the 2nd highest net worth graduated from university at what age

Answers:
30 | 2018 | 10.3 million | Baron Thomson of Fleet | 19