There are 25 white swans and 175 black swans in a nature reserve. How many times are there more black swans than white swans?
一个自然保护区有25只白天鹅和175只黑天鹅．黑天鹅的只数是白天鹅的多少倍？
<gadget id="calculator">175 / 25</gadget>
<output>7</output>

<result>7</result>