Fangfang lives between Dongdong and Tiantian. The house numbers of the three houses are adjacent odd numbers, and the sum of the house numbers of the three houses is 69. What is the house number of Fangfang's house?
芳芳住在东东和甜甜两家的中间，三家门牌号是相邻的奇数，而且三家门牌号之和是69．芳芳家门牌号是多少？
<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<result>23</result>