The combined age of Dad and Grandpa is 129 years old this year. Ten years ago, Grandpa was 37 years older than Dad. How old is Grandpa this year?
爸爸和爷爷今年年龄加起来129岁，十年前爷爷比爸爸大37岁，今年爷爷多大年龄？
<gadget id="calculator">129 + 37</gadget>
<output>166</output>

<gadget id="calculator">166 / 2</gadget>
<output>83</output>

<result>83</result>