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Emily has a field with uniformly cut grass of height 2 cm which grows at a constant rate. In this field she keeps three animals, a rabbit, a goat and a guinea pig. There is enough grass to feed all three for 20 days, the goat and the rabbit for 25 days, the goat and the pig for 33 days and a third days, and the rabbit and the pig for 50 days. How long would it sustain each animal alone?

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