cuboid carton with a square bottom, if its sides are unfolded, it is exactly a square with a side length of 20 cm. What is the volume of this carton in cubic decimeters?
一个底面是正方形的长方体纸盒，如果把它的侧面展开，正好是一个边长为20厘米的正方形．这个纸盒的容积是多少立方分米？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 * 5 * (1/5)</gadget>
<output>5</output>

<result>5</result>