A cylindrical container with a bottom diameter of 20 cm is filled with some water. A conical plumb bob with a height of 12 cm and a bottom diameter of 10 cm is immersed in the water. When the plumb bob is taken out, how many centimeters will the water level drop?
底面直径是20厘米的圆柱形容器中装有一些水，将一个高是12厘米，底面直径是10厘米的圆锥形铅锤浸没水中，取出铅锤时，水面会下降多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">12 / 314</gadget>
<output>6/157 = around 0.038217</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * (6/157)</gadget>
<output>1</output>

<result>1</result>