Add a decimal point before a certain digit of a three-digit number, and then subtract it from the original number. If the difference is 231.66, what is the original number?
在一个三位数的某位数字前添上一个小数点，再和原来的数相减，差是231.66，则原数是多少．
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 - (1/100)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">231.66 / (99/100)</gadget>
<output>234</output>

<result>234</result>