A farm raises 800 ducks, the number of chickens is 5/8 of ducks, and the number of geese is 7/10 of chickens. How many chickens are there?
一个饲养场养鸭800只，鸡的只数是鸭的(5/8)，鹅的只数是鸡的(7/10)，鸡有多少只？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">800 * (5/8)</gadget>
<output>500</output>

<result>500</result>