The perimeter of a rectangle is twice the perimeter of the square. The side length of the square and the width of the rectangle are both 20 cm. What is the length of the rectangle in cm?
一个长方形的周长是正方形周长的2倍，正方形的边长与长方形的宽都为20厘米，长方形的长是多少厘米？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

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

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

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

<result>60</result>