The combined age of Naughty and Xiaoxiao this year is 20 years old. A few years later, when Xiaoxiao is as old as Naughty this year, the age ratio of Naughty and Xiaoxiao is 4:3. How old is Naughty this year?
今年淘气和笑笑的年龄和是20岁，几年后，当笑笑的年龄是淘气今年这么大时，淘气和笑笑的年龄的比是4：3，淘气今年多少岁．
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">1 - (4/3)</gadget>
<output>-1/3 = around -0.333333</output>

<gadget id="calculator">1 + 1 + (-1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">20 / (5/3)</gadget>
<output>12</output>

<result>12</result>