There is a rectangular tablecloth and a square tablecloth with the same perimeter. It is known that the side length of the square tablecloth is 80 cm. The width of the rectangular tablecloth is 50 cm. What is the length in cm?
有一个长方形和一个正方形的桌布，它们的周长相等，已知正方形桌布的边长是80厘米，长方形桌布的宽是50厘米，长是多少厘米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 - 50</gadget>
<output>110</output>

<result>110</result>