If the divisor is 31, the quotient is 12, and the remainder is 20, what is the dividend?
如果除数是31，商是12，余数是20，那么被除数是多少．
<gadget id="calculator">31 * 12</gadget>
<output>372</output>

<gadget id="calculator">372 + 20</gadget>
<output>392</output>

<result>392</result>