After moving the decimal point of a decimal to the right by 1 place, the number is 1.8 larger than the original number. What is the original number?
把一个小数的小数点向右移动1位后，比原来的数大了1.8，原来这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>0.2</result>