Math Problem : C.33 Famous problem of bacteria

If you put one bacteria in the bottle which split into two bacteria in one minute, the bottle was filled with bacteria in 120 minutes. 

How many minutes does it take for this bottle to be half by bacteria ?









Answer
119 minutes

Solution
It takes 119 minutes to be exactly half of the bottle because it increases twice in 1 minute. 

It is just one minute before the time of full of the bottle.