The length of the towel is 7 decimeters and the width is 4 decimeters. What is the circumference of the towel?
毛巾长是7分米，宽是4分米，这个毛巾的周长是多少分米．
<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>