When a number is divided by 9, the quotient is 47 and the remainder is 2. What is the number?
一个数除以9，商是47，余数是2，这个数是多少．
<gadget id="calculator">47 * 9</gadget>
<output>423</output>

<gadget id="calculator">423 + 2</gadget>
<output>425</output>

<result>425</result>