The ratio of length to width of a rectangle is 5:2, the length is 20 cm, what is its width in cm?
一个长方形的长和宽的比是5：2，长是20厘米，它的宽是多少厘米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">20 / (5/2)</gadget>
<output>8</output>

<result>8</result>