The area of a rectangle is 40 square decimeters and the length is 8 decimeters. What is the perimeter of this rectangle?
一个长方形的面积是40平方分米，长是8分米，这个长方形的周长是多少分米？
<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>