In a cuboid container with a length of 20 decimeters and a width of 15 decimeters, there is water 20 decimeters deep. Now sink a cube of iron with a side length of 30 cm into the water, what is the depth of the water in the container at this time?
在一个长20分米，宽15分米的长方体容器中，有20分米深的水．现在在水中沉入一个棱长30厘米的正方体铁块，这时容器中水深多少分米．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">3 * 3 * 3</gadget>
<output>27</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">27 / 300</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">(9/100) + 20</gadget>
<output>2_009/100 = around 20.09</output>

<result>2_009/100 = around 20.09</result>