Qiangqiang has some toys, if his toy number is added to 9, multiplied by 9, subtracted from 9, divided by 9, the result is still 9, how many toys does Qiangqiang have?
强强有一些玩具，如果他的玩具数加上9，乘9，减去9，除以9，其结果还是9，强强有多少个玩具．
<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">81 + 9</gadget>
<output>90</output>

<gadget id="calculator">90 / 9</gadget>
<output>10</output>

<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<result>1</result>