Xiao Ming and Xiao Gang are 25 years old this year. Four years later, Xiao Gang will be 3 years older than Xiao Ming. So how old will Xiao Gang be in four years?
今年小明和小刚年龄和是25岁，四年后，小刚比小明大3岁，那么四年后小刚多少岁．
<gadget id="calculator">25 + 3</gadget>
<output>28</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 + 4</gadget>
<output>18</output>

<result>18</result>