Xiaopang's age this year multiplied by 9 plus 9 is grandpa's age of 81 this year. How old is Xiaopang next year?
小胖今年的年龄乘以9再加上9就是爷爷今年的年龄81岁，小胖明年几岁？
<gadget id="calculator">81 - 9</gadget>
<output>72</output>

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

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>