The forest farm planted 2,400 trees this year, which is 1/5 more than last year. How many trees were planted last year?
林场今年植树2400棵，比去年多植(1/5)，去年植树多少棵？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">2_400 / (6/5)</gadget>
<output>2_000</output>

<result>2_000</result>