Grandpa is 6 times older than Xiaoxin and 3 years older. Grandpa is 57 years old this year. How old is Xiaoxin? (column equation solution)
爷爷的年龄比小欣的6倍还大3岁，今年爷爷57岁，小欣多少岁？(列方程解答)
<gadget id="calculator">57 - 3</gadget>
<output>54</output>

<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<result>9</result>