SOLUTION: There is a herd of 45 penguins. 15 penguins decide to migrate to another herd. What is the percent change of penguins?

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Question 1057621: There is a herd of 45 penguins. 15 penguins decide to migrate to another herd. What is the percent change of penguins?
Answer by Alan3354(69443) About Me  (Show Source):
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There is a herd of 45 penguins. 15 penguins decide to migrate to another herd. What is the percent change of penguins?
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Of which herd?