Hongfang Primary School voluntarily planted 360 trees this year, 20% more than last year. How many trees were voluntarily planted last year?
红坊小学今年义务植树360棵，比去年多植树20%，去年义务植树多少棵？
<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">360 / (6/5)</gadget>
<output>300</output>

<result>300</result>