Xiaoqiang is 11 years old this year, and Xiaojun is 17 years old this year. When the sum of their ages is 38 years old, how old is Xiaoqiang?
小强今年11岁，小军今年17岁，当两人的年龄和是38岁时，小强多少岁．
<gadget id="calculator">38 - 11 - 17</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 11</gadget>
<output>16</output>

<result>16</result>