The number of chickens in the farm is 1200 fewer than ducks, and the ratio of chickens to ducks is 3:5. How many ducks are there?
饲养场鸡的只数比鸭少1200只，鸡与鸭的比是3：5，鸭有多少只？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1_200 / (1/4)</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 * (5/8)</gadget>
<output>3_000</output>

<result>3_000</result>