The area of a rectangle is 45 square meters, the width is 5 meters, and the circumference is in meters.
长方形面积45平方米，宽5米，周长多少米．
<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>