Question

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.

Answer 1

@mathway

Answer 2

@UsukiDoll

Answer 3

The volume of the cone is

V = (1/3) * pi * r^2 * h

Answer 4

you want 2/3 of that

Answer 5

Thanks!

Answer 6

welcome

Answer 7

I got 1017.8, is that correct?

Answer 8

2/3 of that is 678.5 I think.

Answer 9

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

Answer 10

2/3 of that is 75.36 cm^3

Answer 11

oh, geez, my math was off.