There are a total of 960 swans and red-crowned cranes in a nature reserve, and the number of swans is 2.2 times that of red-crowned cranes. How many swans are there?
一个自然保护区一共有天鹅和丹顶鹤960只，天鹅的只数是丹顶鹤的2.2倍．天鹅有多少只？
<gadget id="calculator">1 + 2.2</gadget>
<output>3.2</output>

<gadget id="calculator">960 / 3.2</gadget>
<output>300</output>

<gadget id="calculator">300 * 2.2</gadget>
<output>660</output>

<result>660</result>