There are 45 black swans in the nature reserve, 36 less white swans than black swans. How many times are there more black swans than white swans?
自然保护区有黑天鹅45只，白天鹅比黑天鹅少36只．黑天鹅的只数是白天鹅的几倍？
<gadget id="calculator">45 - 36</gadget>
<output>9</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<result>5</result>