A certain village planted 600 trees this year, 20% more than last year. How many trees did you plant last year?
某村今年植树600棵，比去年多植树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">600 / (6/5)</gadget>
<output>500</output>

<result>500</result>