This year, the age ratio between my father and me is 4:1, and I am seven years old. In a few years, the age ratio between father and son will be 10:3.
今年爸爸与我的年龄比是4：1，我今年七岁，再过多少年，父子两人的年龄比是10：3．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">10 / 3</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">(10/3) * 7</gadget>
<output>70/3 = around 23.333333</output>

<gadget id="calculator">28 - (70/3)</gadget>
<output>14/3 = around 4.666667</output>

<gadget id="calculator">(10/3) - 1</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">(14/3) / (7/3)</gadget>
<output>2</output>

<result>2</result>