Dad is 25 years older than Zhang Ming, and his age is 3.5 times that of Zhang Ming. How old is Zhang Ming? (column equation solution)
爸爸比张明大25岁，爸爸的年龄是张明的3.5倍，张明今年多少岁？(列方程解答)
<gadget id="calculator">3.5 - 1</gadget>
<output>2.5</output>

<gadget id="calculator">25 / 2.5</gadget>
<output>10</output>

<result>10</result>