cylindrical container with a bottom radius of 6 cm is equal in height to a cone container with a bottom radius of 9 cm. Now fill the cone container with water and pour it into the cylinder. The water depth is 1.5 cm lower than (4/5) of the container. How deep is the cylindrical container in centimeters?
底面半径是6厘米的圆柱体容器与底面半径9厘米的圆锥体容器高相等，现把圆锥体容器装满水倒入圆柱内，水深比容器的(4/5)低1.5厘米．圆柱体容器深多少厘米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">(1/3) * 3.14 * 81</gadget>
<output>84.78</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">84.78 / 113.04</gadget>
<output>0.75</output>

<gadget id="calculator">(4/5) - 0.75</gadget>
<output>0.05</output>

<gadget id="calculator">1.5 / 0.05</gadget>
<output>30</output>

<result>30</result>