yes i think there will be same criteria

senoirs please solve this problem with detail:

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 the bacteria to fill one half of the dish?

a. 10 days
b. 15 days
c. 24 days
d. 29 days
e. 29.5 days

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"Bibliophile"