Let x, y be two different numbers, stipulate x□y=(x+y)/4. Find the value of a in a□16=10.
设x，y为两个不同的数，规定x□y=(x+y)/4．求a□16=10中a的值．
<gadget id="calculator">40 - 16</gadget>
<output>24</output>

<result>24</result>