What is the average of the three adjacent numbers 49, 50, and 51?
49、50、51这三个相邻数的平均数是多少．
<gadget id="calculator">49 + 50 + 51</gadget>
<output>150</output>

<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<result>50</result>