Posted by **Sam** on Sunday, October 14, 2012 at 3:57pm.

The doubling time of a city's population is 17 years. How long does it take for the population to quadruple?

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**Steve**, Sunday, October 14, 2012 at 4:02pm
as long as it takes to double twice: 34 years

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**Sam**, Sunday, October 14, 2012 at 4:03pm
How did you get that?

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**Steve**, Sunday, October 14, 2012 at 4:07pm
come on, man. quadrupling means doubling twice. Each doubling takes 17 years.

after 17 years, the initial population P has grown to 2P

after 17 more years, the population 2P has grown to 2(2P) = 4P, and is quadruple the initial population of P.

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