There is a cylindrical container with a height of 8 cm and a volume of 50 ml, which is filled with water. A cylindrical rod is completely immersed in the water in the container, and the water overflows. After the rod is drawn out of the water, the height of the water is only 6 cm. Find the volume of the rod.
有一个高8厘米，容积50毫升的圆柱形容器，装满水，将一个圆柱形棒全部浸入容器水中，有水溢出．把棒从水中抽出后，水的高度只有6厘米，求棒的体积．
<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">(25/2) * 2</gadget>
<output>25</output>

<result>25</result>