A square steel billet with a side length of 20 cm is forged into a cuboid mold with a height of 80 cm and a length of 20 cm. What is the area of the bottom of the mold?
一块正方体钢坯，棱长是20厘米，把它锻造成一个高80厘米，长20厘米的长方体模具，模具的底面积是多少？
<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 * 20 * (1/4)</gadget>
<output>100</output>

<result>100</result>