Five years ago, the age of the mother was 8 times that of the son. The mother is 37 years old. How old is the son?
5年前母亲的岁数是儿子的8倍，母亲今年37岁，儿子今年多少岁？
<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<gadget id="calculator">37 - 5</gadget>
<output>32</output>

<gadget id="calculator">40 + 32</gadget>
<output>72</output>

<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<result>9</result>