Úloha ID 383 - 
Ve třech městech žije dohromady 92 000 obyvatel. Na každých 50 obyvatel připadá 1 automobil. V prvním a druhém městě mají dohromady 1 550 automobilů ve druhém a třetím 940 automobilů.
Kolik automobilů je ve městě s největším počtem obyvatel?
Správná odpověď je: A
Jestliže má automobil každý padesátý a počet obyvatel je 92 000, pak počet aut je 1840. Tedy A+B+C=1840. Také víme, že A+B=1 550 a B+C=940. Máme tedy soustavu tří rovnic o třech neznámých, jejichž řešením se dostaneme k údajům B=650, C=290 a A=900.
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