The volume of a cuboid wood is 20 cubic decimeters, the cross-sectional area is 4 square decimeters, what is the length of the wood in decimeters.
一根长方体木料的体积是20立方分米，横截面积是4平方分米，木料长是多少分米．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>