My uncle Isacc and his cows

Level pending

My uncle Isaac has a big field divided into three areas of equal size. In the first area, my uncle has \(70 \) cows, and he told me, "these cows will eat all this grass in only \( 24 \) days". In the second area, my uncle put \( 30 \) cows, and he said, "they'll eat all the grass in \( 60 \) days". In the third field, my uncle wants the grass to last for \( 96 \) days. How many cows does he need?

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