The ages of Xiaoming, Xiaohong and Xiaogang are exactly 3 consecutive odd numbers, and the sum of their ages is 45 years old. How old is the youngest of them?
小明、小红、小刚3个人的年龄正好是3个连续的奇数，他们的年龄总和是45岁．他们中最小的是多少岁？
<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<result>13</result>