The father is 32 years older than the son this year. After 4 years, the father will be 5 times the age of the son. How old is the son this year?
父亲今年比儿子大32岁，4年后，父亲年龄是儿子的5倍，今年儿子几岁？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

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

<result>4</result>