In 1998, the combined age of grandpa and dad was 127 years old, and grandpa was 37 years older than dad that year. What year was grandpa born?
1998年，爷爷和爸爸的年龄和是127岁，那年爷爷比爸爸大37岁．请问爷爷是哪年出生的？
<gadget id="calculator">127 + 37</gadget>
<output>164</output>

<gadget id="calculator">164 / 2</gadget>
<output>82</output>

<gadget id="calculator">1_998 - 82</gadget>
<output>1_916</output>

<result>1_916</result>