In a cylindrical container filled with water with a bottom diameter of 40 cm, a conical iron block with a bottom radius of 5 cm and a height of 30 cm is submerged. How many centimeters did the water in the container drop when the iron block was removed?
在一个底面直径为40厘米的装有水的圆柱形容器中，没入一个底面半径为5厘米，高30厘米的圆锥形铁块．当取出铁块后，容器中的水下降了多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">30 / 1_256</gadget>
<output>15/628 = around 0.023885</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * (15/628)</gadget>
<output>0.625</output>

<result>0.625</result>