The number of white rabbits is 540, and the number of black rabbits is five times that of white rabbits. How many more black rabbits are there than white rabbits?
白兔的只数是540只，黑兔的只数是白兔的5倍，黑兔比白兔多多少只？
<gadget id="calculator">540 * 5</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 - 540</gadget>
<output>2_160</output>

<result>2_160</result>