The perimeter of a rectangle is equal to the perimeter of a square. The perimeter of the square is 160 meters, the width of the rectangle is 20 meters, what is the length in meters?
一个长方形的周长和一个正方形周长相等．正方形周长为160米，长方形宽是20米，长是多少米？
<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 - 20</gadget>
<output>60</output>

<result>60</result>