Xiao Ming is 10 years old this year, and his mother is 38 years old this year. When Xiao Ming is 15 years old, how old is his mother?
小明今年10岁，妈妈今年38岁，当小明15岁时，妈妈多少岁？
<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">38 + 5</gadget>
<output>43</output>

<result>43</result>