The sum of three consecutive natural numbers is 153, what is the middle natural number? (column equation solution)
三个连续自然数的和是153，中间的自然数是多少？(列方程解答)
<gadget id="calculator">153 - 1</gadget>
<output>152</output>

<gadget id="calculator">1 + 152</gadget>
<output>153</output>

<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<gadget id="calculator">153 / 3</gadget>
<output>51</output>

<result>51</result>