If the side length of a square is 25 cm and the perimeter of a rectangle is 50 cm, what is the difference between the perimeter of the square and the perimeter of the rectangle in cm?
一个正方形边长是25厘米，一个长方形周长是50厘米，正方形的周长与长方形的周长相差多少厘米．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 50</gadget>
<output>50</output>

<result>50</result>