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A pond has flowers in it each day the flowers in the pond get doubled if the pond gets full-on 20th day, on which day the pond will fill half? How?

We are sitting here in the office in a group and the source is one of my friends

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    $\begingroup$ it seems like that this puzzle comes from elsewhere. please provide the source. unattributed work may get downvoted or even closed. happy puzzling ;) $\endgroup$ – Omega Krypton Oct 22 at 12:00
  • $\begingroup$ Ohh Yes. We are sitting here in the office in a group and the source is one of my friends. Happy puzzling :) $\endgroup$ – SPnL Oct 22 at 12:04
  • $\begingroup$ Good job @OmegaKrypton $\endgroup$ – SPnL Oct 22 at 12:10
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Answer

the 19th day

Explanation

Pond gets full (volume = 1 pond) on 20th day. One day before, pond is 1*1/2 = half pond full

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