Úloha ID 1605 - 
Marek vykoná práci za poloviční dobu než František a Pepa ji vykoná za třikrát delší čas než Marek.
Které z následujících tvrzení je pravdivé?
Správná odpověď je: B
Součet práce Marka, Františka a Pepy pro jednotku času (bereme M = 1, F = 1/2 atd.) je 1 + 1/2 + 1/3 = 11/6. Pokud Marek pracuje sám, zvládne 6/6 = 1. Pomocí trojčlenky na nepřímou úměru (čím menší díl práce zvládne, tím více času nad tím stráví) by Marek odvedl stejnou práci za 110 minut. A je tedy špatně. Pro odvození správnosti B stačí zjistit čas Marka: Pepa pracuje 60 minut, Marek třetinu času, tedy 20 minut. František pracuje dvojnásobek Markovy doby, tedy 40 minut.
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