There are 1,800 chickens in the farm. The number of chickens accounts for (3/5) of the total number of chickens, ducks and geese, and the number of ducks accounts for (1/4) of the total number. How many ducks are kept in the farm?
饲养场养鸡1800只，鸡的只数占鸡、鸭、鹅总只数的(3/5)，鸭的只数占总只数的(1/4)，饲养场养鸭多少只？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_800 / (3/5)</gadget>
<output>3_000</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3_000 * (1/4)</gadget>
<output>750</output>

<result>750</result>