The poultry farm raises 580 ducks, which is 40 more than the number of chickens (2/5). How many chickens are raised in the poultry farm?
家禽养殖场养鸭580只，比养鸡只数的(2/5)多40只，家禽养殖场养鸡多少只？
<gadget id="calculator">580 - 40</gadget>
<output>540</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">540 / (2/5)</gadget>
<output>1_350</output>

<result>1_350</result>