A rectangular dining table is 150 cm long, and its width is 100 cm shorter than its length. What is the perimeter of this rectangular dining table in cm?
一个长方形餐桌，长150厘米，宽比长短100厘米，这个长方形餐桌的周长是多少厘米？
<gadget id="calculator">150 - 100</gadget>
<output>50</output>

<gadget id="calculator">150 + 50</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>