If the length of a rectangle is 6 cm and the width is 4 cm, what is its perimeter?
一个长方形的长是6厘米，宽是4厘米，它的周长是多少分米．
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<result>2</result>