In a rectangular parallelepiped container with a bottom area of 72 square centimeters and a height of 10 centimeters, there is water with a depth of 4 centimeters, and a cube iron block with a side length of 6 centimeters is placed in it. How deep is the water in centimeters at this time?
在一个底面积72平方厘米、高10厘米的长方体容器中，有深4厘米的水，在其中放入一个棱长6厘米的正方体铁块，这时水深多少厘米？
<gadget id="calculator">6 * 6 * 6</gadget>
<output>216</output>

<gadget id="calculator">216 / 72</gadget>
<output>3</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>