When a certain number is added to itself, subtracted, multiplied, or divided, the sum, difference, product, and quotient obtained is 100. So, what is this number.
某一个数与自己相加，想减，相乘，相除，得到的和、差、积、商之和是100．那么，这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>