After the decimal point of a decimal is moved one place to the right, the sum of the original decimal is 12.1. What is the original decimal?
一个小数的小数点向右移动一位后，与原小数的和是12.1，原来这个小数是多少．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">12.1 / 11</gadget>
<output>1.1</output>

<result>1.1</result>