A square iron block with a side length of 5 cm is forged into a rectangular parallelepiped iron block with a width and a height of 2.5 cm. How many centimeters is the length of this rectangular parallelepiped iron block?
把一块棱长是5cm的正方体铁块锻压成一块宽和高都是2.5cm的长方体铁块，这块长方体铁块长多少厘米？
<gadget id="calculator">2.5 * 2.5</gadget>
<output>6.25</output>

<gadget id="calculator">5 / 6.25</gadget>
<output>0.8</output>

<gadget id="calculator">5 * 5 * 0.8</gadget>
<output>20</output>

<result>20</result>