The length of a rectangle is 20 decimeters, and its length is 5/4 of its width. What is its area?
一个长方形的长是20分米，长是宽的(5/4)，它的面积是多少平方分米？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">20 / (5/4)</gadget>
<output>16</output>

<gadget id="calculator">20 * 16</gadget>
<output>320</output>

<result>320</result>