wheat field harvested 18,000 kilograms of wheat last year, an increase of 20% over the previous year. How many kilograms of wheat was harvested in the previous year?
一块小麦田，去年收小麦18000千克，比前年增产了二成．前年收小麦多少千克？
<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">18_000 / (6/5)</gadget>
<output>15_000</output>

<result>15_000</result>