Lijiadun planted 50 hectares of rice this year, an increase of 25% over last year. How many hectares of rice were planted last year?
李家墩今年种植的水稻面积是50公顷，比去年增加二成五，去年种植的水稻面积是多少公顷？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">50 / (5/4)</gadget>
<output>40</output>

<result>40</result>