A particular type of bacteria can under optimal conditions double every 25 minut

Question

A particular type of bacteria can under optimal conditions double every 25 minutes. Imagine that just after a 5 L culture became saturated with bacteria, a researcher poured the saturated culture into an amount of fresh culture that was three times the initial amount of culture (e.g., 5 L original culture is poured into 15 L of fresh culture). How long would it take for this total volume of culture to become saturated again, assuming that optimal conditions prevailed and that no cells died? Enter your answer to the nearest minute.

Explanation / Answer

Here 5L culture saturated with bacteria is added to a 15 L fresh culture. This makes the total volume of culture = 15+5= 20L. If it takes 25 mins to double the population, then 10L of the total solution will be saturated bacteria. So if it doubles it's population in 10L and thereby making it 20 L of saturated solution then it will take another 25 mins. Hence a total of 50 mins is needed to make 20L culture saturated with bacteria

5L ----25 min---> 10L -----25 min ____>20L

With total volume wpopulatio

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