An irregular iron block is placed in a cube container with a side length of 5dm. Now pour 40ml of water into the container (the water does not overflow), and the measured water depth is 2.2dm. What is the volume of this iron block in cubic decimeters?
一个棱长5dm的正方体容器内放有一个不规则的铁块，现在把40ml水倒入容器内(水不外溢)，测得水深2.2dm，这个铁块的体积是多少立方分米．
<gadget id="calculator">5 * 5 * 2.2</gadget>
<output>55</output>

<gadget id="calculator">55 - 40</gadget>
<output>15</output>

<result>15</result>