A number is enlarged by 10 times and is 18 larger than the original number. What is the original number?
一个数扩大10倍后比原来大18，原来这个数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>2</result>