Two squares of the same size are put together to form a rectangle, and the perimeter is 40 cm less than the sum of the perimeters of the original two squares. What is the perimeter of the original square?
两个大小相同的正方形，拼成一个长方形后，周长比原来两个正方形的周长和减少了40厘米，原来一个正方形的周长是多少．
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>