Beach Day by Rodger Bliss
October 2022
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Glass Half Full

You have a bottle of random shape and you want to fill half of it with water. You have available only a pump with unlimited water, nothing else. How will you fill it exactly half way?

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4 guesses to Glass Half Full


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  • I think if you hold the bottle at a 45 degree angle and fill it up until the water spills over, it will be halfway full.

  • Dude

    Great guess but incorrect.

    That method would work with an evenly shaped vessel. This, however, is a randomly shaped receptacle.

    Keep trying.

  • Count the number of pumps it takes to completely fill the vessel. Empty the vessel, and begin refilling it, pumping only half as many times.

  • Dude

    Nope, keep trying.