The Expanding Lily
Brain teaserSkill: Insight
A single water lily is growing across a quiet pond. Each day, the total surface area covered by the lily becomes exactly twice what it covered the day before. The growth continues at this steady rate, and at the end of the thirtieth day, the lily covers the entire surface of the pond.
At the end of which day did the lily cover exactly half of the pond?
Your answer
On which day was exactly half the pond covered?
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Hints
Hint 1
Hint 2Opens after hint 1
Hint 3Opens after hint 2
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