A rectangle has a perimeter of 15.6 meters and a length of 3.95 meters. What is the width of the rectangle in meters?
一个长方形的周长15.6米，长3.95米，长方形的宽是多少米？
<gadget id="calculator">15.6 / 2</gadget>
<output>7.8</output>

<gadget id="calculator">7.8 - 3.95</gadget>
<output>3.85</output>

<result>3.85</result>