Úloha ID 1595 - 
V obchodě s elektronikou bylo 15 zákazníků. Kupovány byly tři druhy zboží – laptopy, telefony a televize. Každý ze zákazníků si koupil nejvýše 1 kus od každého druhu.
Víme, že:
Kolik zákazníků si koupilo méně než tři produkty?
Správná odpověď je: B
Pokud označíme postupně A, B, C, D jako množství lidí, kteří si koupili jen laptop, jen televizi, jen telefon a všechny tři produkty, tak vyřešením soustavy rovnic A + D = 7; B + D = 4; C + D = 8; A + B + C + D = 15 dostáváme D = 2 a A + B + C = 13, což znamená, že jeden produkt si odneslo 13 lidí.
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