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Doubling Lily Pads

Brain Teasers
Exponential Growth
Easy
A lily patch doubles its area each day and covers the entire pond on day . On which day was the pond half covered?
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Hint 1

Work backwards one day.

Hint 2

Halving the area undoes one day of doubling.

Show worked solution

  1. 1. Reverse

    Since the area doubles from day to day , it was half covered on day .

  2. 2. Key idea

    Exponential growth problems are often easiest backwards.

Answer: 29

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