There are two planks of the same length, each 130 cm long, nailed together in the middle to form a long plank, and the overlap between the nails is 10 cm, what is the length of this long plank?
有两块一样长的木板，各长130厘米，中间钉在一起成了一块长木板，中间钉在一起的重叠部分是10厘米，则这块长木板的长度是多少？
<gadget id="calculator">130 - 10</gadget>
<output>120</output>

<gadget id="calculator">130 + 120</gadget>
<output>250</output>

<result>250</result>