A number is expanded to 10 times the original number, and the resulting number is 405 larger than the original number. What is this number?
一个数扩大到原来的10倍，得到的数比原来405，这个数是多少？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">405 / 9</gadget>
<output>45</output>

<result>45</result>