The decimal point of a certain decimal is moved one place to the right, which is 1.8 larger than the original number. What is the original number?
某小数的小数点向右移动一位，比原数大1.8，原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1.8 / 9</gadget>
<output>0.2</output>

<result>0.2</result>