**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...

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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

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

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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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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: 12nd 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 halfsince the bactria doubles in one day

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1st day 372.529% of bacteria is filled2nd day 745.05%by this way on 29th day 50% is filledand the last day 100% bacteria is filled

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4 days

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1st day it fills 1/302nd day it fils 1/30+2/303rd day it fills 1/30+2/30+4/304th 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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