Draw a rectangle whose length to width ratio is 5:2. If the width is 10 cm, what is the length in cm?
画一个长和宽的比是5：2的长方形，如果宽画10厘米，那么长应画多少厘米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

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

<result>25</result>