There are 63 black swans and 56 fewer white swans than black swans. How many times are there more black swans than white swans?
黑天鹅有63只，白天鹅比黑天鹅少56只．黑天鹅的只数是白天鹅的几倍？
<gadget id="calculator">63 - 56</gadget>
<output>7</output>

<gadget id="calculator">63 / 7</gadget>
<output>9</output>

<result>9</result>