If the length of a rectangle is 20 meters and its width is 1/4, what is the area of the rectangle?
一个长方形的长为20米，比宽长(1/4)，这个长方形的面积是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</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>