This year is 2005, the sum of the ages of the parents is 70 years old, and the sum of the ages of the siblings is 16 years old. By 2008, the age of the father is 4 times the age of the younger brother, and the age of the mother is 3 times the age of the elder sister. Then, when How many years is it when the father's age is twice the age of the sister's?
今年是2005年，父母亲年龄和是70岁，姐弟俩的年龄和是16岁，到2008年时，父亲的年龄是弟弟年龄的4倍，母亲的年龄是姐姐的3倍，那么，当父亲的年龄是姐姐年龄的2倍时，是多少年．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">37 - 9 - 9</gadget>
<output>19</output>

<gadget id="calculator">2_005 + 19</gadget>
<output>2_024</output>

<result>2_024</result>