When a number is divided by 9, the quotient and remainder are both 5, what is the dividend?
一个数除以9，商和余数都是5，被除数是多少．
<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<result>50</result>