A rectangular vegetable field is 20 meters long and 8 meters wide. Xiaohong walked around the vegetable field twice, how many meters in total.
一块长方形菜地，长是20米，宽比长短8米．小红绕这块菜地走了两圈，一共走了多少米．
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<gadget id="calculator">32 * 2 * 2</gadget>
<output>128</output>

<result>128</result>