It is known that the length of the rectangle is 12 cm, and the length is 3 times the width. What is the circumference in cm?
已知长方形的长为12厘米，长是宽的3倍，周长是多少厘米？
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>