There is a cylindrical container with a height of 8 cm and a capacity of 50 ml. Fill it with water. Insert a cylindrical rod with a length of 18 cm vertically into the bottom of the cup. Water overflows. When the rod is pulled out of the water, the height of the water is only 6 cm. , find the volume of the cylindrical rod.
有一个高8厘米，容积50毫升的圆柱形容器，装满水，将一只长18厘米圆柱形棒垂直插至杯底，有水溢出，把棒从水中抽出后，水的高度只有6厘米，求圆柱形棒的体积．
<gadget id="calculator">50 / 8</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">(25/4) * 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">8 / 18</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(25/2) / (4/9)</gadget>
<output>225/8 = around 28.125</output>

<result>225/8 = around 28.125</result>