Adding a zero to the end of a number results in a new number 72 greater than the original number. What is the original number.
在一个数的末尾添上一个零，得到的新数比原来的数大72．原数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<result>8</result>