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 sixteenth of the dish?
Choose the correct choice from the following answers:
A) 16 days  B) 26 days  C) 27 days  D) 28 days  E) 29 days
The bacteria doubles each day, so after 29 days, the dish was half full.   After 28 days, the dish was one quarter full.   After 27 days, the dish was one eighth full.   After 26 days, the dish was one sixteenth full.   The answer is 26 days.
<result>B</result>
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 sixteenth of the dish?