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 is the area of a square whose side length is 5 units?
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Math Question: Solve the quadratic equation x^2 + 5x - 6 = 0.