Put water into a cylindrical container with a bottom diameter of 10 cm and a height of 8 cm, and submerge a conical plumb weight with a bottom diameter of 6 cm and a height of 7.5 cm. When the plumb weight is taken out, how many centimeters does the water level drop in the cup?
往一个底面直径是10cm，高是8cm的圆柱形容器中装水，里面浸没一个底面直径6cm，高7.5cm的圆锥形铅锤，当铅锤取出后，杯里水面下降了多少厘米？
<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">(1/3) * 3.14 * 9 * 7.5</gadget>
<output>70.65</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

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

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">70.65 / 78.5</gadget>
<output>0.9</output>

<result>0.9</result>