High School Math Explorer

A water lily grew extremely quickly and doubled its surface area each day.
At the end of the 30th day, it had entirely covered the pond in which it lived.

When was the pond half-covered by the lily?

If a second water lily, identical to the first, had also been in the pond on the first day, how long would the 2 water lilies have taken to cover the entire pond?

When was the pond half-covered by the lily?

If a second water lily, identical to the first, had also been in the pond on the first day, how long would the 2 water lilies have taken to cover the entire pond?

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