If a number is reduced to (1/10) of the original number, the difference between it and the original number is 18. What is the number?
一个数缩小到原数的(1/10)后与原数的差是18，这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">18 / 9</gadget>
<output>2</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<result>20</result>