USMLEGladiator
2009 & still in race
Topics: 135
Posts: 509
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A drug reduces bacterial concentration by 90% in 10 mins.what is minimum time needed to decrease bacterial load of 109(1 billion) to less than 10 bacteria?
1.10
2. 50
3. 100
4. 140.
5.180
i thank ans is 3.
every 10 mins bacterial load should be one tenth.But it should be 90 mins according to me.
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| vallia
Forum Guru
Topics: 98
Posts: 889
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 they are talking about LESS than 10 bacteria so is 100 and not 90...
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