A rectangle has a perimeter of 24 meters and a length of 7 meters, what is its width in meters?
一个长方形的周长是24米，长是7米，它的宽是多少米？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<result>5</result>