A rectangle has a perimeter of 24 decimeters and a length of 8 decimeters. What is the width of this rectangle?
一个长方形，周长是24分米，长8分米，这个长方形的宽是多少？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<result>4</result>