When Xiao Ming divides 7.86 by a number, he regards 7.86 as 76.8, and the resulting quotient is 12. What is the divisor of this question.
小明在计算7.86除以一个数时，把7.86看成76.8，结果商是12．这道题的除数是多少．
<gadget id="calculator">76.8 / 12</gadget>
<output>6.4</output>

<result>6.4</result>