If the average of a and b is 16.5, what is the average of a+5 and b+7?
如果a与b的平均数是16.5，那么a+5与b+7的平均数是多少．
<gadget id="calculator">16.5 * 2</gadget>
<output>33</output>

<gadget id="calculator">33 + 5 + 7</gadget>
<output>45</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>