When a number is divided by 24, the quotient is 17 and the remainder is 9. What is the number?
一个数除以24，商是17，余数是9，这个数是多少．
<gadget id="calculator">24 * 17</gadget>
<output>408</output>

<gadget id="calculator">408 + 9</gadget>
<output>417</output>

<result>417</result>