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The rate of growth of a certain cell culture is proportional to its size. In 10 hours a population of 1 million cells grew to 4 million. How large will the cell culture be after 20 hours? Simplify your final answer to a whole number.

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8 million cells. If 1 million cells in 10 hours grow to 4 million than in 20 hours it would be double that
User SidAhmed
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