The length of a piece of rectangular paper is 12 centimeters. Cut off the largest square from one end of the piece of paper. What is the perimeter of the remaining rectangle in centimeters?
一张长方形纸的长是12厘米，在这张纸的一端剪去一个最大的正方形，剩下的一个长方形的周长是多少厘米．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>