The perimeter of a square is 24 cm. The side length of this square is twice the width of another rectangle. The length of the rectangle is 7 cm. Do you know the perimeter of the rectangle?
一个正方形的周长是24厘米，这个正方形的边长是另一个长方形的宽的2倍，长方形的长是7厘米，你知道长方形的周长是多少吗？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<result>20</result>