My uncle Isacc and his cows
My uncle Isaac has a big field divided into three areas of equal size. In the first area, my uncle has cows, and he told me, "these cows will eat all this grass in only days". In the second area, my uncle put cows, and he said, "they'll eat all the grass in days". In the third field, my uncle wants the grass to last for days. How many cows does he need?
The answer is 20.
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