If a number is 28 more than 39, what is the average of this number and 39?
一个数比39多了28，那么这个数与39的平均数是多少
<gadget id="calculator">39 + 28</gadget>
<output>67</output>

<gadget id="calculator">67 + 39</gadget>
<output>106</output>

<gadget id="calculator">106 / 2</gadget>
<output>53</output>

<result>53</result>