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Teaching Tree Sand Timer Sablier 2 Minutes. Eggs, Time Out, Exercise, Cooking

Teaching Tree Sand Timer Sablier 2 Minutes. Eggs, Time Out, Exercise,  Cooking

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Suppose you would like to boil an egg for exactly 15 minutes. But you only have two hourglasses, one of seven and one of eleven minutes. What is the fastest way to

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Sand Egg Timer 2 Minutes