In a glass fish tank with a length of 50 cm, a width of 40 cm, and a water depth of 20 cm, a cube stone with a side length of 10 cm is placed. At this time, how many cm does the water in the fish tank rise (the stone is completely submerged)?
在一个长50cm，宽40cm，水深为20cm的玻璃鱼缸中，放人一个棱长为10cm的正方体石块，这时鱼缸内的水上升了多少cm(石块被完全淹没)？
<gadget id="calculator">10 * 10 * 10</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">1_000 / 2_000</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>