Cattle Grazing Problems: Problem 1

Problem: There is a piece of meadow where the grass grow at a constant rate. With 12 cows, it takes 25 days to finish grazing the whole meadow; With 24 cows, it takes 10 days to finish grazing the whole meadow. How many cows will it take to finish grazing the grass in 20 days?

Key: Find the rate that the grass is growing in

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