There is a cylindrical container with a bottom diameter of 20 cm and a conical iron block with a bottom radius of 3 cm and a height of 20 cm is submerged in water. When the iron block is taken out, how many centimeters will the water level in the container drop?
有一个底面直径是20cm的圆柱形容器内的水中浸没着一个底面半径是3cm，高是20cm的圆锥形铁块，当取出铁块后，容器中的水面下降几厘米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</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">(1/3) / 314</gadget>
<output>1/942 = around 0.001062</output>

<gadget id="calculator">3.14 * 9 * 20 * (1/942)</gadget>
<output>0.6</output>

<result>0.6</result>