In the formula "(11*口-7*口)/16=2", "口" represents the same number, what is this number.
在算式"(11*口-7*口)/16=2"中，"口"代表同一个数字，这个数字是多少．
<gadget id="calculator">2 * 16</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<result>8</result>