The area of a rectangle is 54 square centimeters, the width is 6 centimeters, what is its perimeter?
一个长方形的面积是54平方厘米，宽是6厘米，它的周长是多少．
<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>