The length of a rectangle is 16 decimeters, and the length is twice the width. What is the perimeter?
长方形的长16分米，长是宽的2倍，周长是多少分米？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">16 + 8</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>