Xiao Song typed 8 characters per minute, Xiao Gang typed twice as fast as Xiao Song, how many characters did Xiao Gang type per minute.
小松每分钟打8个字，小刚打字速度是小松的2倍，小刚每分钟打多少个字．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>