A rectangle has a length of 8 cm and a width of 3 cm less than its length. What is the perimeter of the rectangle in cm?
一个长方形，长是8厘米，宽比长少3厘米，这个长方形的周长是多少厘米．
<gadget id="calculator">8 - 3</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>