The combined age of father and grandfather is 127 years old. Ten years ago, grandpa was 27 years older than father. How old was grandpa ten years ago?
爸爸和爷爷现在的年龄加起来是127岁，十年前爷爷比爸爸大27岁，十年前爷爷的年龄是多少岁？
<gadget id="calculator">127 + 27</gadget>
<output>154</output>

<gadget id="calculator">154 / 2</gadget>
<output>77</output>

<gadget id="calculator">77 - 10</gadget>
<output>67</output>

<result>67</result>