Modelová Otázka ID 1919 - 
7 % z neznámého čísla je o 297 menší než jeho 40 %. Čemu se rovná 20 % z neznámého čísla?
Správná odpověď je: C
Pokud neznámé číslo označíme například x, tak: 0,07x · 297 = 0,4x. Zjisíme, že x = 900 a 20 % z x je tedy 180.
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