What is the average weight of 20 students in a class if their weights are 120, 130, 135, 140, 125, 130, 135, 150, 155, 125, 130, 140, 135, 130, 145, 160, 155, 150, 135, and 140 pounds?
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What are the square roots of 25, 36, and 49?
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What is the length, in kilometers, of a road that is 2500 meters long?