In a glass tank with a length of 25 cm, a width of 20 cm, and a height of 25 cm, there is a square iron block with a side length of 10 cm. At this time, the water depth is 15 cm. How many centimeters is the depth of the water?
在一只长25厘米，宽20厘米，高25厘米的玻璃缸中，有一块棱长10厘米的正方体铁块，这时水深15厘米，如果把这块铁块从缸中取出来，缸中的水深多少厘米？
<gadget id="calculator">25 * 20</gadget>
<output>500</output>

<gadget id="calculator">10 / 500</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">10 * 10 * (1/50)</gadget>
<output>2</output>

<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<result>13</result>