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?

• When bacterias double their size from half dish to full dish in one day and fill dish in 30 days,
  it clearly means that on 29 th day, the dish was half full of bacteria.
• 13 years agoHelpfull: Yes(27) No(2)
• ans is 29 days...
  the size of bacteria get doubled each day so it is half of dish on 29th day and full on 30th day
• 13 years agoHelpfull: Yes(8) No(2)
• 29 days.
  
  Agree with Mr. PP Singh.
• 13 years agoHelpfull: Yes(5) No(3)
• Since bacteria doubles each day and it gets filled in 30 days, the previous day i.e.29th day the laboratory is filled with half
• 13 years agoHelpfull: Yes(4) No(0)
• 29 days
  
  then on 30 th day, they will double and fill the dish.
• 13 years agoHelpfull: Yes(3) No(1)
• 29 days because it takes 30 days to fill a dish and size of the bacteria
  doubles each day
• 13 years agoHelpfull: Yes(3) No(0)
• Mr pp Singh please explain the answere
• 13 years agoHelpfull: Yes(1) No(2)
• 4 days.
  let the size of bacteria be x.for 30 days 30x.
  if it doubles....x+2x+4x+8x=15x(half of the dish).
  so four days.
• 13 years agoHelpfull: Yes(1) No(9)
• yes it is 29 days..
  
  thanks Mr pp singh...
• 13 years agoHelpfull: Yes(1) No(1)
• To fill one half it requires 1 day. So to become half it requires 29 days
• 13 years agoHelpfull: Yes(1) No(1)
• 
  The size of bacteria doubles each day it means from half dish it will become full dish in one day. As the dish gets filled in 30 days, So it means the dish was half full of bacteria on 29th day and became full on 30th day.
• 13 years agoHelpfull: Yes(1) No(0)
• answer is 29 days...every day the size becomes double and on the 30th day it is filled completely...so for this to happen it should be only half fillled on the 29th day
• 12 years agoHelpfull: Yes(1) No(0)
• 29 days
  u pls think
  on 29th day it will be half
  on next day it fills up
• 12 years agoHelpfull: Yes(1) No(1)
• answer 29 days because on 29th day, it doubles to full
• 12 years agoHelpfull: Yes(1) No(0)