The age of the mother last year was 7 times that of the son. The mother is 29 years old this year. How old is the son?
妈妈去年的年龄是儿子的7倍，妈妈今年29岁，儿子今年多少岁？
<gadget id="calculator">29 - 1</gadget>
<output>28</output>

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

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>