A rectangular pillowcase with a length of 75 cm and a width of 45 cm, with lace embroidered around it, how long is the lace?
一个长方形枕套，长75厘米，宽45厘米，四周绣上花边，需要多长的花边？
<gadget id="calculator">75 + 45</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<result>240</result>