The reciprocal of the sum of three consecutive natural numbers is (1/9), what is the average of these three consecutive natural numbers?
三个连续自然数的和的倒数是(1/9)，这三个连续自然的平均数是多少？
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<result>3</result>