farmer raises a total of 960 chickens and ducks, and the ratio of the number of chickens to ducks is 9:7. How many more chickens are raised than ducks?
一个农户养鸡、鸭共960只，鸡和鸭数量的比是9：7．养的鸡比鸭多多少只？
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<gadget id="calculator">960 / 16</gadget>
<output>60</output>

<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<result>120</result>