The students planted 300 trees this year, 20% more than last year. How many trees were planted last year?
同学们今年植树300棵，比去年多植树20%，去年植树多少棵？
<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">300 / (6/5)</gadget>
<output>250</output>

<result>250</result>