Jianshe Township planted 6 million trees this year, an increase of 20% over last year. How many thousands of trees were planted last year?
建设乡今年植树600万棵，比去年增加了20%，去年植树多少万棵？
<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>