There is a division formula, its divisor is 9, the quotient and remainder are equal, what is the minimum dividend.
有一个除法算式，它的除数是9，商和余数相等，被除数最小是多少．
<gadget id="calculator">1 * 9</gadget>
<output>9</output>

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

<result>10</result>