A cuboid iron blank with an edge length of 10 cm is forged into a cuboid iron block with a length of 40 cm and a height of 2 cm. Find the width of the cuboid iron block.
把一个棱长是10厘米的正方体铁胚锻造成一个长是40厘米，高2厘米的长方体铁块，求这个长方体铁块的宽．
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">10 / 80</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">10 * 10 * (1/8)</gadget>
<output>25/2 = around 12.5</output>

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