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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?

Asked by: Interview Candidate | Asked on: Mar 4th, 2006
Showing Answers 1 - 18 of 18 Answers
Suraj

Answered On : Mar 6th, 2006

It'll take 29 days to fill half.

  
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nithiya devi

Answered On : Mar 21st, 2006

the answer is 29 days

  
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mohan kumar

Answered On : May 19th, 2006

seven and a half days

  
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lohithkschalam

Answered On : Jul 24th, 2006

IT TAKES 29 DAYS TO FILL ONE HALF OF THE DISH..............

  
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Kmalesh malviya

Answered On : Jul 27th, 2006

Obviosly it will take 29 days ,since on the 30th day it will be doubled and get filled...

Yes  1 User has rated as useful.
  
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sabarinath

Answered On : Aug 10th, 2006

View all answers by sabarinath

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.

  
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raju

Answered On : Sep 17th, 2006

yes it is 29 days

  
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Brijesh Kumar

Answered On : Apr 7th, 2007

seefirstday -> 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

  
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sushma

Answered On : Apr 27th, 2007

 it takes 7 and a half days to fill the dish

  
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AMMINIPREETHY

Answered On : Jun 26th, 2007

View all answers by AMMINIPREETHY

how come it yakes only 7 day to fill the dish half? Plz can u explain me

  
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J T V GUPTA

Answered On : Jul 1st, 2007

Preethi here is the solution


Suppose a 30kg container will be filled in 30 days by putting 1kg bacteria on each day

On first day 1kg is put into the dish in 30 kgs.

Second day it will be doubled 2+second days 1kg

Third day it will be 6kgs+third day 1kg

Fourth day it will be 14kgs+1kg

Fifth day it will be 30kgs

  
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narayanan

Answered On : Aug 20th, 2007

29 will be the correct answer. We have to go from the bottom. On the 29th day it will be half of the tank since on the 30th day it is filled.

  
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carthi1985

Answered On : Oct 9th, 2007

First day: 1
2nd day: 2+1 (it doubles 1 to 2 and +1 for the day)
3rd day: 6+1 (it doubles 3 to 6 and +1 for the day)
So on..

  
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29 days to fill half
since the bactria doubles in one day

  
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chozha

Answered On : Mar 15th, 2008

View all answers by chozha

1st day 372.529% of bacteria is filled
2nd day 745.05%
by this way on 29th day 50% is filled
and the last day 100% bacteria is filled

  
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p.mohan

Answered On : May 22nd, 2008

View all answers by p.mohan

4 days

  
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p.mohan

Answered On : May 22nd, 2008

View all answers by p.mohan

1st day it fills 1/30
2nd day it fils 1/30+2/30
3rd day it fills 1/30+2/30+4/30
4th day it fills 1/30+2/30+4/30+8/30=1/2

  
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kasthuri

Answered On : Oct 15th, 2011

Let A1 -> increased area
A-> original area

A1=1.69%(since it is increased by 69%)

A1=s1^2
1.69 S^2=S1^2
S1->increased side
S->original side

therefore taking square root on both sides
1.3 S=S1
therefore s is increased by .3 i.e 30%

  
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