The sum of three consecutive odd numbers is 27, what is the smallest odd number?
三个连续奇数的和为27，则最小的奇数是多少．
<gadget id="calculator">27 - 2</gadget>
<output>25</output>

<gadget id="calculator">2 + 25</gadget>
<output>27</output>

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

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 2</gadget>
<output>7</output>

<result>7</result>