A rectangular glass mirror is 60 cm long and 40 cm wide. A frame is nailed with wooden strips around it. How many centimeters should the wooden strips be at least?
一个长方形玻璃镜，长60厘米，宽40厘米，在它的四周用木条钉上边框，至少用木条多少厘米？
<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<result>200</result>