If a□b means the addition of a and b is divided by 9, find the value of a in a□16=10.
如果a□b表示把a和b加起来被9除，求a□16=10中a的值．
<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">90 - 16</gadget>
<output>74</output>

<result>74</result>