The forest farm planted 540 pine trees this year, 1/5 more than last year. How many pine trees did the forest farm plant last year?
林场今年植松树540棵，比去年多植(1/5)．林场去年植松树多少棵？
<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">540 / (6/5)</gadget>
<output>450</output>

<result>450</result>