There are 45 black swans, 40 more black swans than white swans. How many times are there more black swans than white swans?
黑天鹅有45只，黑天鹅比白天鹅多40只．黑天鹅的只数是白天鹅的几倍？
<gadget id="calculator">45 - 40</gadget>
<output>5</output>

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

<result>9</result>