A puzzle 5
A biology scientist was studying one of the types of micro-organisms,
he put one of them on an empty Microscope slide,
After 20 seconds , it split into 2 ,
After other 20 seconds , the 2 split into 4 ,
and so on.
After an hour , the slide became semi-filled.
How long more (in seconds) will it take the slide to become fully filled ?
The answer is 20.
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Assume that the number of micro-organisms now is A. Because it is half full then 2A is needed to fill the slide up. Because it doubles every 20 seconds, after 20 seconds the number of micro-organisms will be 2A, which fully fills the slide.