This year, my grandfather is 6 times as old as Xiaohua, and twice as old as my father. After 12 years, my father will be twice as old as Xiaohua. Ask Xiaohua how old his grandfather is this year.
今年爷爷年龄是小华的6倍，是爸爸的2倍，12年后爸爸的年龄是小华的2倍，问小华的爷爷今年多少岁．
<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<gadget id="calculator">24 - 12</gadget>
<output>12</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>