Xiaohua took a photo and wanted to make a wooden photo frame for the photo. The length of the photo frame is 25 cm and the width is 20 cm. At least how many centimeters of wooden strips should be prepared?
小华拍了一张照片，要给照片做一个木质相框．相框的长是25厘米，宽是20厘米．至少要准备多少厘米的木条？
<gadget id="calculator">25 + 20</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<result>90</result>