There are 270 ducks on the farm, and the number of chickens is 20% less than the number of ducks. How many chickens are there?
农场有鸭270只，鸡的只数比鸭的只数少20%，鸡有多少只？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">270 * (4/5)</gadget>
<output>216</output>

<result>216</result>