The actual afforestation in Ninghai County last year increased by 1/5 compared with the original plan, and the actual afforestation was 600 hectares. How many hectares were originally planned for afforestation?
宁海县去年实际造林比原计划增加(1/5)，实际造林600公顷，原计划造林多少公顷？
<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">600 / (6/5)</gadget>
<output>500</output>

<result>500</result>