It is stipulated that a※b=(a+b)/2, then 15※7=how much.
规定a※b=(a+b)/2，那么15※7=多少．
<gadget id="calculator">15 + 7</gadget>
<output>22</output>

<gadget id="calculator">22 / 2</gadget>
<output>11</output>

<result>11</result>