Xiao Ming does 8 math problems per minute, while Xiao Gang does three times as much as Xiao Ming. How many more oral arithmetic questions does Xiaogang do than Xiaoming per minute?
小明每分钟做8道口算题，小刚每分钟做的是小明的3倍．小刚每分钟比小明多做几道口算题？
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>