Grandpa Li walked 3 times around a rectangular lawn that is 6 meters long and 4 meters wide. How many meters did he walk in total?
李爷爷围着一个长6米，宽4米的长方形草坪走了3圈，他一共走了多少米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 3</gadget>
<output>60</output>

<result>60</result>