Cut out the largest square from a piece of rectangular paper with a length of 60 cm and a width of 40 cm. What is the perimeter of the remaining rectangular paper in cm?
将一张长60厘米，宽40厘米的长方形纸，剪下一个最大的正方形，剩下的长方形纸的周长是多少厘米．
<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 + 40</gadget>
<output>60</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<result>120</result>