Chickens, ducks, and geese are raised in the farm. Chickens and ducks account for (3/5) of the total, and chickens and geese account for (2/3) of the total. What percentage of the total are chickens?
养殖场养了鸡、鸭、鹅三种家禽，鸡和鸭共占总数的(3/5)，鸡和鹅共占总数的(2/3)，鸡占总数的几分之几？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<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">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<result>4/15 = around 0.266667</result>