It takes 30 days to fill a laboratory dish with bacteria. If the size ofthe bactiria doubles each day, how long did it take for the bactiria to fill one half of dish?

In 30th day the bacteria is completely filled in the dish and per day the size is doubled. Hence at 29th day the dish must me half. So the ans is 29 days.Send me some recent wipro placementpapers.

raju

Sep 17th, 2006

yes it is 29 days

Brijesh Kumar

Apr 7th, 2007

see firstday -> x then second day it becomes ->2x then third days ->4x ans so on 8x , 16x , 32x then it ll cross 60 , when it has 64 x... then it takes more than 7 days

## It takes 30 days to fill a laboratory dish with bacteria. If the size ofthe bactiria doubles each day, how long did it take for the bactiria to fill one half of dish?

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