A rectangle has a width of 10 cm and a length of (2/5), what is the area of the rectangle?
一个长方形，宽是10厘米，是长的(2/5)，这个长方形的面积是多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 / (2/5)</gadget>
<output>25</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<result>250</result>