Answer:
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Step-by-step explanation:
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The solution would be like this for this specific problem:
Volume of a cylinder = pi * r^2 * h
Volume of a cone = 1/3 * pi * r^2 * h
Total Height = 47
Height of the cone = 12
Height of the cylinder = 35
If the top half is filled with sand, then:
volume (sand) = pi * 4^2 * 36
volume (cone) = 1/3 * pi * 4^2 * 12
Total volume = 1960.353816 cubic millimeters
353816 / (10 * pi) = 62.4 seconds.
It will take 62.4 seconds until all of the sand has dripped to the bottom of the hourglass.
Calculate -4 to the power of -3 and get -1/64.
Come back to the equation & substitute -4³ as -1/64.
The opposite of -1/64 is +1/64.
Add 4 and 1/64 to get 257/64 (take 64 as the LCM).
It's Probably 15, if I'm wrong correct me :P
