Dad is 32 years old this year. After 4 years, his son will be 1 year older than his father (1/3). How old is his son this year?
爸爸今年32岁，4年后儿子的年龄比爸爸的(1/3)还多1岁，儿子今年多少岁？
<gadget id="calculator">32 + 4</gadget>
<output>36</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">36 * (1/3)</gadget>
<output>12</output>

<gadget id="calculator">1 - 4</gadget>
<output>-3</output>

<gadget id="calculator">12 + (-3)</gadget>
<output>9</output>

<result>9</result>