Add a zero at the end of a two-digit number, and the resulting three-digit number is 126 greater than the original number. What is the original two-digit number?
在一个两位数的末尾添上一个零，所得的三位数比原数大126，原来这个两位数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">126 / 9</gadget>
<output>14</output>

<result>14</result>