If two squares of the same size are put together to form a rectangle, the perimeter is 10 centimeters less than the sum of the perimeters of the original two squares. What is the perimeter of the original square in centimeters?
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周长的和减少了10厘米，原来一个正方形的周长是多少厘米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>