A survey was conducted with 100 Bahamians and found: 42 have bank accounts at RBC 35 have bank accounts at Scotia 32 have bank accounts at Commonwealth Bank 13 have bank accounts at RBC and Scotia 11 have bank accounts at RBC and Commonwealth Bank 10 have bank accounts at Scotia and Commonwealth Bank 6 bank with all 3 banks 19 do not have a banking account anywhere. How many Bahamians bank at exactly one bank? Answer: