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

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) (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
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