<p>A right circular cylinder vase with an inner base radius of 6 inches is filled with water to a height of 20 inches. After a smaller solid right circular cylinder with base radius of 4 inches is then completely submerged in the water, the height of the water is 24 inches. What is the height, in inches, of the smaller cylinder?</p>
<p>I really don't understand what this question is talking about, and an explanation of the problem and/or answer would be helpful.</p>
<p>Thanks.</p>