Xiao Ming can only do 14 math problems per minute, and Xiao Gang can do twice as much as Xiao Ming per minute. How much more does Xiao Gang do per minute than Xiao Ming?
小明每分钟只能做14道口算题，小刚每分钟做的是小明的2倍．小刚比小明每分钟多做多少道？
<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 - 14</gadget>
<output>14</output>

<result>14</result>