For a decimal, if the decimal point is moved one place to the right, the resulting number will increase by 19.98. What is the original number of this decimal?
一个小数，如果把小数点向右移动一位，所得的数比原来增加了19.98，这个小数原来是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">19.98 / 9</gadget>
<output>2.22</output>

<result>2.22</result>