The radius of the bottom surface of a cylindrical glass jar is 20 cm, and water is contained in the jar. A conical iron block with a bottom surface radius of 10 cm and a height of 30 cm is completely submerged in water (the water does not overflow), and the water surface in the glass jar How many centimeters does it rise?
一个圆柱形玻璃缸的底面半径是20厘米，缸内盛有水，将一个底面半径是10厘米，高是30厘米的圆锥形铁块完全浸没在水中(水没有溢出)，玻璃缸中的水面上升多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</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 * 100 * (15/628)</gadget>
<output>2.5</output>

<result>2.5</result>