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- KimJaFo

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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- KimJaFo

- KimJaFo

- DanJS

The volume of the cone is
V = (1/3) * pi * r^2 * h

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- DanJS

you want 2/3 of that

- KimJaFo

Thanks!

- DanJS

welcome

- KimJaFo

I got 1017.8, is that correct?

- KimJaFo

2/3 of that is 678.5 I think.

- DanJS

\[\frac{ 1 }{ 3 }*3.14 * 9 * 12 \approx 113.04\]

- DanJS

2/3 of that is 75.36 cm^3

- KimJaFo

oh, geez, my math was off.

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