There are 3000 chickens, the number of geese is chicken (3/5), and the number of ducks is 1/4 of goose, how many ducks are there?
鸡有3000只，鹅的只数是鸡的(3/5)，鸭的只数是鹅的(1/4)，鸭有多少只？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">3_000 * (3/5) * (1/4)</gadget>
<output>450</output>

<result>450</result>