square iron block with a side length of 5 decimeters is melted and cast into a rectangular iron block with a width of 2 decimeters and a height of 5 decimeters. What is the length of this rectangular iron block?
把一个棱长5分米的正方体铁块，熔铸成一个宽2分米、高5分米的长方形铁块，这个长方形铁块的长是多少？
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 * 5 * (1/2)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>