A breeding factory raises 1200 ducks, and raises fewer chickens than ducks (3/5). How many chickens and ducks are there altogether?
一个饲养厂养鸭1200只，养的鸡比鸭少(3/5)，养的鸡和鸭一共有多少只？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1_200 * (2/5)</gadget>
<output>480</output>

<gadget id="calculator">480 + 1_200</gadget>
<output>1_680</output>

<result>1_680</result>