The perimeter of a rectangle is 24.6 meters and the length is 7.4 meters. What is the width of the rectangle in meters?
一个长方形的周长是24.6米，长是7.4米，这个长方形的宽是多少米？
<gadget id="calculator">24.6 / 2</gadget>
<output>12.3</output>

<gadget id="calculator">12.3 - 7.4</gadget>
<output>4.9</output>

<result>4.9</result>