There is a glass tank with a length of 50 cm, a width of 40 cm, a height of 30 cm, and a water depth of 20 cm. If a cube with a side length of 10 cm is put into the tank, how deep is the water in the tank?
有一个长50厘米，宽40厘米，高30厘米的玻璃缸，水深20厘米．如果把一块棱长10厘米的正方体石块放进缸中，缸内水深多少厘米？
<gadget id="calculator">10 * 10 * 10</gadget>
<output>1_000</output>

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

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

<gadget id="calculator">20 + (1/2)</gadget>
<output>41/2 = around 20.5</output>

<result>41/2 = around 20.5</result>