There are two brothers and sisters. In 2004, the father’s age was 4 times the combined age of the siblings. In 2010, the father’s age was twice the combined age of the siblings. When was the father born?
有兄妹两人，2004年的时候爸爸的年龄是兄妹俩年龄和的4倍，2010年的时候爸爸的年龄是兄妹俩年龄和的2倍，爸爸是哪年出生的？
<gadget id="calculator">2_010 - 2_004</gadget>
<output>6</output>

<gadget id="calculator">2 * 6 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 - 6</gadget>
<output>18</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">2_004 - 36</gadget>
<output>1_968</output>

<result>1_968</result>