Tibetan chicken farms raise 28,000 laying hens this year, which is 2/5 more than last year, and how many thousands of laying hens were raised last year.
藏鸡场今年养蛋鸡2.8万只，比去年多养了(2/5)，去年养了多少万只．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">2.8 / (7/5)</gadget>
<output>2</output>

<result>2</result>