There are 38 white rabbits in the farm, and the number of black rabbits is 20 times that of white rabbits. How many more black rabbits are there than white rabbits?
养殖场有白兔38只，黑兔只数是白兔的20倍，养的黑兔比白兔多几只？
<gadget id="calculator">38 * 20</gadget>
<output>760</output>

<gadget id="calculator">760 - 38</gadget>
<output>722</output>

<result>722</result>