cylindrical container with a bottom radius of 20 cm measured from the inside holds water at a depth of 90 cm. A conical iron block with a bottom radius of 10 cm is completely sunk into the container, and the water level rises by 5 cm. What is the height of this conical iron block?
一个圆柱形容器，从里面量底面半径为20厘米，里面盛有90厘米深的水，现将一个底面半径为10厘米的圆锥形铁块完全沉入容器里，水面上升了5厘米．这个圆锥形铁块的高是多少厘米？
<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400 * 5</gadget>
<output>6_280</output>

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

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

<gadget id="calculator">3 / 314</gadget>
<output>3/314 = around 0.009554</output>

<gadget id="calculator">6_280 * (3/314)</gadget>
<output>60</output>

<result>60</result>