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Quandaries & Queries
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 Topic: doubling time
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 Two problems 2010-04-13 From Dorothy:1. Explain why the number 123, 456, 789, 101, 112 cannot be a perfect square. (Hint: What is the units digit?) 2. A substance doubles in volume every minute. At 9:00A.M., a small amount is placed in a container. At 10:00A.M., the container is just full. At what time was the container one-eighth full?Answered by Robert Dawson. Doubling time 2005-03-12 From Nick:Looking for the equation to how many years it will take to double the population given the growth rate is 7%.Answered by Penny Nom. A colony of bacteria 2000-04-22 From Nicci Demmin:Suppose that the bacteria in a colony can grow unchecked, by the law of exponential change. The colony starts with one bacterium and doubles every half hour. How many bacteria will the colony contain at the end of 50 hours?Answered by Penny Nom.

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