The difference between a large number and a small number is 270, remove the 0 in the single digit of the large number, the size of the two numbers is exactly equal, what is the decimal
大数与小数之差是270，去掉大数个位上的0，大小两数正好相等，小数是多少
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">270 / 9</gadget>
<output>30</output>

<result>30</result>