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

29days

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chinnu

  • Nov 2nd, 2005
 

thanks 4 keeping these kind of questions.

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kiruthiga

  • Jan 30th, 2006
 

on 29th day it wil b half the jar and on the next day it wil double and the whole dish will b filled with bacteria.

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ecejmr

  • Oct 6th, 2010
 

5 days

Consider the capacity of laboratory dish as 30. Each day bacteria amount will doubles.

Therefore, 1st day 1 bacteria, 2nd day 2 bacteria,3rd day 4 bacteria and so on...

1+2+4+8+16= 31.... 5th day it filled

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bharathreddy511

  • Oct 20th, 2010
 

1day work is 1/30
1st day work=1/30
2nd day work=2/30
3rd day work=4/30
so on.....
5th day work =16/30

Total work is= 1/30(1+2+4+8+16)=31/30
Therefore total work will be completed in 5days

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deenadhayalan

  • Sep 15th, 2011
 

29 days (using back tracking)
30-1 =29 it will fill half of the dish... after 29 th day it will be double.

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shikha suveer

  • Sep 25th, 2011
 

29 days

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prititripathi

  • Oct 2nd, 2011
 

since it is given that it takes total days to fill is 30

and every day it fill twice of previous day

so on 29th day it was half and on 30th day it filled completely as

said twice every next day

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