The area of a rectangular lawn is 285 square meters, the width is 9.5 meters, and the circumference is how many meters.
一块长方形草地的面积是285平方米，宽是9.5米，周长是多少米．
<gadget id="calculator">285 / 9.5</gadget>
<output>30</output>

<gadget id="calculator">30 + 9.5</gadget>
<output>39.5</output>

<gadget id="calculator">39.5 * 2</gadget>
<output>79</output>

<result>79</result>