A cylindrical glass with a bottom diameter of 20 cm is filled with water. A conical plumb weight with a bottom diameter of 6 cm and a height of 20 cm is placed in the water. The plumb weight is completely submerged in the water. When the plumb weight is taken out, How many centimeters will the water level drop in the cup?
一个底面直径是20厘米的圆柱形玻璃杯中装着水，水里放着一个底面直径是6厘米，高是20厘米的圆锥形铅锤，铅锤完全浸没在水中，那么当铅锤取出后，杯中的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">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</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">20 / 314</gadget>
<output>10/157 = around 0.063694</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * (10/157)</gadget>
<output>0.6</output>

<result>0.6</result>