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9 September, 22:55

Lily is a lilypad in a small pond. Lily doubles in size each day. On the 20th day she covers the whole pond. On what day was Lily half the size of the pond?

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  1. 9 September, 23:13
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    19th day

    Step-by-step explanation:

    So say Lily was 1 when Lily was planted

    First day Lily is 2

    Second day Lily is 4

    Third day Lily is 8

    etc ...

    See the pattern?

    The pattern is 2^x

    On the 20th day, Lily was 2^20

    So when Lily was half, Lily was 2^20 / 2

    2^x = 2^20 / 2

    2^x = 2^19

    On the 19th day, Lily was half.
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