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KimJaFo

  • one year ago

An hourglass, composed of two identical cones, is 12 cm tall. The radius of each cone is 3 cm. If you want to fill the bottom half of the hourglass 2/3 full of salt, how much salt will you need? Explain the method you would use to find the amount of salt. I just need to know how to solve this, I have completely forgotten.

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  1. KimJaFo
    • one year ago
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    @mathway

  2. KimJaFo
    • one year ago
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    @UsukiDoll

  3. DanJS
    • one year ago
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    The volume of the cone is V = (1/3) * pi * r^2 * h

  4. DanJS
    • one year ago
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    you want 2/3 of that

  5. KimJaFo
    • one year ago
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    Thanks!

  6. DanJS
    • one year ago
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    welcome

  7. KimJaFo
    • one year ago
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    I got 1017.8, is that correct?

  8. KimJaFo
    • one year ago
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    2/3 of that is 678.5 I think.

  9. DanJS
    • one year ago
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    \[\frac{ 1 }{ 3 }*3.14 * 9 * 12 \approx 113.04\]

  10. DanJS
    • one year ago
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    2/3 of that is 75.36 cm^3

  11. KimJaFo
    • one year ago
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    oh, geez, my math was off.

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spraguer (Moderator)
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