There are 800 chickens in the farm. The number of geese is 1/4 of that of chickens and 5/8 of that of ducks. How many ducks are there in the farm?
养殖场有鸡800只，鹅的只数是鸡的(1/4)，是鸭的(5/8)，养殖场鸭有多少只？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(1/4) / (5/8)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">800 * (2/5)</gadget>
<output>320</output>

<result>320</result>