Two squares of the same size are put together to obtain a rectangle whose perimeter is 20 cm less than the sum of the perimeters of the original two squares. What is the perimeter of the resulting rectangle in centimeters?
两个一样大小的正方形拼在一起得到一个长方形，它的周长比原来两个正方形周长的和减少了20厘米，拼成的长方形的周长是多少厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 4 * 2</gadget>
<output>80</output>

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

<result>60</result>