The horse sense mystery
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The “Horse Sense” Mystery. By Richard Holden. Farmer Henry had 17 horses. He would like to give his oldest son ½ of them, his middle son 1/3 of them and his youngest son 1/9 of them. How could he accomplish this?. Simple! First, he borrows one horse from his neighbor---.

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Presentation Transcript

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Farmer Henry had 17 horses.

He would like to give his oldest son ½ of them, his middle son 1/3 of them and his youngest son 1/9 of them.

How could he accomplish this?


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Simple!

First, he borrows one horse from his neighbor---

There are now a total of 18 horses.


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He then gives ½ of them to his oldest son

½ x 18 = 9

Oldest son’s


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Next, he gives 1/3 of them to his middle son.

1/3 x 18 = 6

Oldest son’s

Middle son’s


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Finally, he gives his youngest son 1/9 of the horses.

1/9 x 18 = 2

Oldest son’s

Middle son’s

Youngest son’s


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Thanks for the use of your horse, Jeb.

You are a mathematical magician, Henry!

He then returned the remaining horse to his neighbor


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How Did Henry Do It?

  • It’s all in the math!

  • The 3 fractions never added to one whole

  • Instead---

    1 = 9

    2 18

    1 = 6

    3 18

    1 = 2

    9 18

+

17/18


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