In a rectangular parallelepiped container with a length of 10 decimeters and a width of 15 decimeters, there is water 20 decimeters deep. Now a cube iron object with a side length of 60 centimeters is completely submerged in the water. How deep is the water in the container at this time?
在一个长10分米，宽15分米的长方体容器中，有20分米深的水，现在在水中完全浸没一个棱长60厘米的正方体铁器，这时容器中的水深多少分米？
<gadget id="calculator">10 * 15</gadget>
<output>150</output>

<gadget id="calculator">6 / 150</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">6 * 6 * (1/25)</gadget>
<output>36/25 = around 1.44</output>

<gadget id="calculator">20 + (36/25)</gadget>
<output>536/25 = around 21.44</output>

<result>536/25 = around 21.44</result>