The area of a rectangle is 40m**2 and its length is 8m. What is its perimeter?
一个长方形的面积是40米**2，长是8米，它的周长是多少？
<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>