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If a doctor gives you 3 pills and tells you to take one pill every half hour, how long would it take before all the pills had been taken? I know the answer is 1/3, but I don't know how to get to it.? What is the role of the brain if simple reflex is sufficient for basic functioning in the real world? What is half of 2 1/2 cups? What is the lowest common multiple of 3,4,5, and 16?