A duck farm raises 300 ducks this year, which is (1/5) more than last year. How many ducks did you raise last year?
一个养鸭场，今年养鸭300只，比去年多养上(1/5)．去年养鸭多少只？
<gadget id="calculator">1 / 5</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">300 / (6/5)</gadget>
<output>250</output>

<result>250</result>