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It takes 3 grandmas 3 hours to knit 3 hats. How long would it take 50 grandmas to knit 50 hats?
50 hours 1 hour 150 hours 3 hours
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While on safari in Africa, Ernest Hemingway was almost fatally injured. How did it happen?
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Which river caught on fire multiple times in 1969, which resulted in the Clean Water Act, Great Lakes Water Quality Agreement, and the creation of the federal Environmental Protection Agency?