The number of roosters in the chicken farm is 3/5 that of hens, and there are 600 more hens than roosters. How many chickens are there in total?
养鸡场里公鸡的只数是母鸡的(3/5)，母鸡比公鸡多600只，一共养了多少只鸡？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">600 / (2/5)</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 - 600</gadget>
<output>900</output>

<gadget id="calculator">900 + 1_500</gadget>
<output>2_400</output>

<result>2_400</result>