After a number is expanded to 10 times, the sum of the original number is 84.15. What is the original number?
一个数扩大到它的10倍后与原来这个数相加的和是84.15，原来这个数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">84.15 / 11</gadget>
<output>7.65</output>

<result>7.65</result>