Cattle Grazing Problems: Problem 4

Problem: On a pasture, the grass grows at a constant rate. 14 cows can finish it in 30 days. 70 sheep can finish it in 16 days (the amount of grass a cow consumes per day is four times that of the amount of grass a sheep consumes). How many days will it take 17 cows and 20 sheep to finish the entire pasture?

Key: Turn 2 animals into a problem with 1 animal

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