In 2002, the age of the father was 5 times that of the son, and in 2010, the age of the father was 3 times that of the son. In what year was the father born?
2002年父亲是儿子年龄的5倍，2010年父亲年龄是儿子的3倍，问父亲出生在哪一年？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(3/2) - (5/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">8 / (1/4)</gadget>
<output>32</output>

<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">2_002 - 40</gadget>
<output>1_962</output>

<result>1_962</result>