A rectangle is 7 meters wide and 2 meters longer than it is wide. What is the circumference in decimeters.
一个长方形，宽是7米，长比宽多2米．周长是多少分米．
<gadget id="calculator">7 + 2 + 7</gadget>
<output>16</output>

<gadget id="calculator">16 * 2 * 10</gadget>
<output>320</output>

<result>320</result>