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[Sachikanta25]

There are Brown and Black cows. In five days four black cows and 3 brown cows give as mush as milk that four brown cows and 5 black cows give in four days. If the black cow gives 10 liters of milk per day, how
many liters of milk the Brown cow will give in one day?

[gen2]

The brown cows give no milk at all.

then 5 x 4 x 10 = 4 x 5 x 10 for the black ones.