The farm planted 180 hectares of wheat this year, an increase of (1/5) compared to last year. How many hectares of wheat were planted last year?
农场今年种小麦180公顷，比去年增加了(1/5)，去年种小麦多少公顷？
<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">180 / (6/5)</gadget>
<output>150</output>

<result>150</result>