When a number is divided by 50, the quotient is 12 and the remainder is 13. What is the number?
一个数除以50，商是12，余数是13，这个数是多少．
<gadget id="calculator">50 * 12</gadget>
<output>600</output>

<gadget id="calculator">600 + 13</gadget>
<output>613</output>

<result>613</result>