A conical plumb bob with a bottom radius of 4 cm is immersed in a cylindrical container filled with water, and the diameter of the bottom surface of the container is measured from the inside to be 10 cm. After taking out the plumb bob, the water level drops 5 cm, what is the height of the plumb bob?
把一个底面半径是4厘米的圆锥形铅锤浸没在装有水的圆柱形容器中，从里面量得容器的底面直径是10厘米．取出铅锤后，水面下降5厘米，这个铅锤的高是多少？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 16 * (1/3)</gadget>
<output>16.746667</output>

<gadget id="calculator">5 / 16.746667</gadget>
<output>0.298567</output>

<gadget id="calculator">3.14 * 25 * 0.298567</gadget>
<output>23.43751</output>

<result>23.43751</result>