The decimal point of a two-digit number is moved one place to the right, which is 17.28 larger than the original number. What is the original number?
一个两位小数的小数点向右移动一位，比原数大17.28，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">17.28 / 9</gadget>
<output>1.92</output>

<result>1.92</result>