A city planted 54 hectares of trees this year, 20% more than last year. How many hectares were planted last year?
某市今年植树54公顷，比去年多20%，去年植树多少公顷？
<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">54 / (6/5)</gadget>
<output>45</output>

<result>45</result>