In a division without remainder, the sum of the dividend and the divisor is 312, and the quotient is 12. What is the dividend?
在一个没有余数的除法算式中，被除数与除数的和是312，商是12，被除数是多少？
<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">312 / 13</gadget>
<output>24</output>

<gadget id="calculator">24 * 12</gadget>
<output>288</output>

<result>288</result>