A square is divided into four identical rectangles. The perimeter of each small rectangle is 20 cm. What is the perimeter of the large square in cm?
一个正方形被分成了四个完全相同的长方形，每个小长方形的周长是20厘米，原来这个大正方形的周长是多少厘米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 + (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">20 / (5/2)</gadget>
<output>8</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>