A farm has 600 chickens. There are more ducks than chickens (2/3), more ducks than geese (1/4), how many more ducks than chickens?
某养殖场鸡有600只．鸭比鸡多(2/3)，鸭比鹅多(1/4)，鸭比鸡多多少只？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">600 * (5/3)</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 600</gadget>
<output>400</output>

<result>400</result>