A piece of sugarcane field harvested 6 tons of sugarcane this year, an increase of 20% compared to last year. How many tons of sugarcane were harvested last year?
一块甘蔗地，今年收甘蔗6吨，比去年增产两成，去年收甘蔗多少吨？
<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">6 / (6/5)</gadget>
<output>5</output>

<result>5</result>