Bacteria doubles every 3 minutes. It is N in 1 hour, when was it N/4?

54 minutes.

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pragna

  • Apr 9th, 2006
 

step 1:

        3min -> 2(double)

        1hr(60min)-> ?(N)  so, N=(60*2)/3 =40

step 2:

       N(40)->60min

      N/4(10)->?(ans) so, ans=(60*10)/40=18

   

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infor

  • May 1st, 2006
 

the only diff. in the pattern is that time is multiplying by a factor of 3 and the bacteria by a rate of 2. So at 60 th min.. the time multiplication factor is 20 so the bacteria multiplication is N now if we divide both by a factor if 4, it will make 60/4=15 so at the 15th minute the bacteria is N/4.

SK

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Bharani

  • May 10th, 2006
 

In 60min its N.so...

60min----N

57 min----n/2(because every 3 min it doubles)

54 min-----N/4

Ashokkumar

  • Jun 12th, 2006
 

it is N in 60 mins,so N/2 in 57 mins --> (N/2)/2 in 45 mins... so correct answer is 54 minutes.....

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