chicken farm raised 15,600 chickens this year, and last year it raised 20% fewer chickens than this year. How many more chickens did the chicken farm raise this year than last year?
一个养鸡场今年养鸡15600只，去年比今年少养鸡20%，养鸡场今年比去年多养鸡多少只？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15_600 * (1/5)</gadget>
<output>3_120</output>

<result>3_120</result>