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by eaakbari » Thu Nov 15, 2012 11:30 am
A right circular cone, twice as tall as it is wide at its greatest width, is pointing straight down. The cone is partially filled with water, which is dripping out of a tiny hole in the cone's tip at a rate of 2 cubic centimeters per hour. If the water were to continue to drip out at this rate, how much longer would it take for the cone to empty, assuming that no water is added to the cone and that there is no loss of water from the cone by any other means?

(1) The top surface of the water in the cone is currently square centimeters in area.
(2) The top surface of the water in the cone currently is exactly 4 centimeters below the cone's top, measuring vertically.
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by Brent@GMATPrepNow » Fri Nov 16, 2012 7:22 am
Unless I'm missing something, this question is out of scope. The GMAT does not require us to know how to find the volume of a cone.

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by eaakbari » Fri Nov 16, 2012 7:37 am
I didn't know that.

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by eaakbari » Fri Nov 16, 2012 7:39 am
Brent,

Which solid figure's are tested then?

I started preparing 10 days back and have only 20 more to go. The last thing I want to do is waste time on topic's that are out of scope.
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by Brent@GMATPrepNow » Fri Nov 16, 2012 7:46 am
eaakbari wrote:Brent,

Which solid figure's are tested then?

I started preparing 10 days back and have only 20 more to go. The last thing I want to do is waste time on topic's that are out of scope.
To determine whether a topic is out of scope, it's useful refer to the Official Guide (OG). The OG lists the volume formulas for only two solids:
- rectangular solid (box)
- cylinder

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