Subtract an integer number from 810, divide the difference by the integer number, the quotient is 8, what is the integer number?
从810里面减去一个整十数，得到的差再除以这个整十数，商是8，这个整十数是多少？
<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">810 / 9</gadget>
<output>90</output>

<result>90</result>