Question

Water lilies double in area every 24 hours. At the beginning of the summer, there is one water lily on a lake. It takes 60 days for the lake to become completely covered with water lilies. On what day is the lake half covered?

Answer 1

It will take 59 days to cover the lake half.
Since it takes 24 hours to double the area, the next 24 hours ( 1 day) it will be fully covered.

Answer 2

The lake is half-covered on the 59th day.

• Since it is given that the water lilies double in area in every 24 hours, thus when it is the 59th day, the number of water lilies will be just covering half of the lake.
• This question tries to analyse our logical ability thinking. We just need to think this question in a mathematical way.