The grandfather is 74 years old this year. Ten years ago, the age of the grandfather was 8 times that of the grandson. How old is the grandson this year?
爷爷今年74岁，10年前爷爷的年龄是孙子的8倍，孙子今年多少岁．
<gadget id="calculator">74 - 10</gadget>
<output>64</output>

<gadget id="calculator">64 / 8</gadget>
<output>8</output>

<gadget id="calculator">8 + 10</gadget>
<output>18</output>

<result>18</result>