If a※b means ((a+b)/2), then 5※(4※8)=how much.
如果a※b表示((a+b)/2)，那么5※(4※8)=多少．
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">11 / 2</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>