Multiple choice general knowledge math & puzzles

After how many days will half of the pool be covered by the water-lily?

  1. 10

  2. 19

  3. 15

  4. 11
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a classic riddle where a lily doubles in size every day to cover a pool in 20 days, it would cover half the pool on the 19th day (the day before it doubles to fill the whole pool).

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