The livestock farm raised 120 more cattle this year than last year, which is 20% more than last year. How many cows did this livestock farm raise last year?
畜牧场今年比去年多养牛120头，比去年多养20%．这个畜牧场去年养牛多少头？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">120 / (1/5)</gadget>
<output>600</output>

<result>600</result>