What about those who are in school? or retired? or home-makers?
Edited to add:
Per the CIA World Factbook, our workforce is 155 million, including the unemployed. Our population is 316 million, of which about 20% are under 14, and less than 35% are under 25. If we assume everyone under 25 is too young to work (which is crazy, but will give conservative numbers here) then we have 100% * (1 - 155/(316 * .65)) = 24.5% adults who aren't working or seeking work, which is right about the 25% in Brazil. If we assume everyone above 14 should be working (obviously overly aggressive, but for reference) we get 100% * (1 - 155/(316 * .8)) = 38.6%.
Edited to add:
Per the CIA World Factbook, our workforce is 155 million, including the unemployed. Our population is 316 million, of which about 20% are under 14, and less than 35% are under 25. If we assume everyone under 25 is too young to work (which is crazy, but will give conservative numbers here) then we have 100% * (1 - 155/(316 * .65)) = 24.5% adults who aren't working or seeking work, which is right about the 25% in Brazil. If we assume everyone above 14 should be working (obviously overly aggressive, but for reference) we get 100% * (1 - 155/(316 * .8)) = 38.6%.