A cuboid water tank is submerged in a cube iron block with a side length of 10 cm. The length of the water tank is 40 cm, the width is 20 cm, and the water depth is 25 cm. When the iron block is taken out, what is the distance in centimeters from the water surface to the bottom of the tank?
一个长方体水箱中浸没了一块棱长是10cm的正方体铁块，从里面量水箱的长是40cm，宽是20cm，水深是25cm，当取出这块铁块后，水面离箱底的距离是多少厘米？
<gadget id="calculator">40 * 20 * 25</gadget>
<output>20_000</output>

<gadget id="calculator">10 * 10 * 10</gadget>
<output>1_000</output>

<gadget id="calculator">20_000 - 1_000</gadget>
<output>19_000</output>

<gadget id="calculator">40 * 20</gadget>
<output>800</output>

<gadget id="calculator">19_000 / 800</gadget>
<output>95/4 = around 23.75</output>

<result>95/4 = around 23.75</result>