The chicken farm raises 400 chickens this year, which is (1/4) more than last year. How many chickens did you raise last year?
养鸡场今年养鸡400只，比去年增加了(1/4)．去年养鸡多少只？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">400 / (5/4)</gadget>
<output>320</output>

<result>320</result>