Water is filled in a container in such a manner that its volume doubles after every five minutes. If takes 30 minutes for the container to be full, in how much time will it be one fourth full?
- A7 minutes and 30 seconds
- B10 minutes
- C20 minutesCorrect
- D25 minutes
Explanation
To solve this problem, we need to work backward from the time the container is full.
The volume of water doubles every five minutes. This means that five minutes before the container was full, it must have been half full.
The container is full at 30 minutes. Therefore, it was half full five minutes earlier, at 25 minutes.
Following the same logic, five minutes before it was half full, it must have been one fourth full. Subtracting another five minutes from 25 minutes gives us 20 minutes.
The container was one fourth full at 20 minutes.
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