The perimeter of a square is 12 centimeters. If 7 such squares are used to form a rectangle, what is the perimeter in centimeters?
一个正方形的周长是12厘米，如果用7个这样的正方形摆成一个长方形，它的周长是多少厘米．
<gadget id="calculator">12 * 7</gadget>
<output>84</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 12</gadget>
<output>36</output>

<gadget id="calculator">84 - 36</gadget>
<output>48</output>

<result>48</result>