For a two-digit number, the sum of the ones digit and the tens digit is 9. After the ones digit and the tens digit are interchanged, the new two digits are 27 larger than the original two digits. What is the original two-digit number.
一个两位数，个位数字与十位数字的和是9，把个位数字与十位数字互换后，新的两位数比原来的两位数大27．原来的两位数是多少．
<gadget id="calculator">27 - 9</gadget>
<output>18</output>

<gadget id="calculator">90 + 18</gadget>
<output>108</output>

<gadget id="calculator">10 - 1 - 1</gadget>
<output>8</output>

<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">108 / 18</gadget>
<output>6</output>

<gadget id="calculator">9 - 6</gadget>
<output>3</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 + 6</gadget>
<output>36</output>

<result>36</result>