Xiao Ming has 6 cards, and Xiao Hong has twice as many cards as Xiao Ming. How many cards does Xiao Hong and Xiao Ming have in total?
小明有6张卡片，小红的卡片数是小明的2倍，小红和小明一共有卡片多少张．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<result>18</result>