Population of a colony doubles every 5 hours, how long will it take for the population to triple?

Question

The population of a certain colony of bacteria doubles every 5 hours, how long will it take for the population to triple? Give the answer to 2 significant digits

Answer 1

Guest 9307 is correct. Do NOT listen to anyone else's answer. 7.5 hours seems like the logical choice when you do not perform the necessary calculations, but when you use logarithms (like you are supposed to), you come out with 7.92 (or 7.9, since two significant digits) hours.