A forest farm planted 4,800 trees this year, 20% more than last year. How many trees did you plant last year?
某林场今年植树4800棵，比去年多植20%．去年植树多少棵？
<gadget id="calculator">20 / 100</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">4_800 / (6/5)</gadget>
<output>4_000</output>

<result>4_000</result>