The sum of the decimal point of a number moved one place to the right and the original decimal is 19.8, what is this number
一个数的小数点向右移动一位后与原来小数的和是19.8，这个数是多少
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">19.8 / 11</gadget>
<output>1.8</output>

<result>1.8</result>