SOLUTION: We're studying Logarithms in school and I understand it but have problems with word problems. Don't know how to even begin to set up an equation in form of a logarithm (possibly) t

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Question 145158: We're studying Logarithms in school and I understand it but have problems with word problems. Don't know how to even begin to set up an equation in form of a logarithm (possibly) to solve this word problem. Any help would be very appreciated. Thanks.

A computer is infected with the Sasser virus. Assume that it infects 20 other computers within 5 minutes; and that these PCs and servers each infect 20 more machines within another five minutes, etc. How long until 100 million computers are infected?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let t="time in minutes" __ 10^8=1[20^(t/5)] __ taking log __ log(10^8)=(t/5)log(20)

dividing by log(20) __ 8/log(20)=t/5 __ multiplying by 5 __ 40/log(20)=t