If the length of a rectangle is 10 cm and its width is 4 cm, what is the perimeter of the rectangle in cm?
一个长方形的长是10厘米，比宽长4厘米，这个长方形的周长是多少厘米．
<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">6 + 10</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>