There are 60 more chickens than ducks in the farm, and the number of ducks is 20% less than that of chickens. How many ducks are there?
饲养场养的鸡比鸭多60只，养鸭的只数比鸡少20%，养鸭多少只？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 / (1/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 60</gadget>
<output>240</output>

<result>240</result>