An orchard has 800 fruit trees this year, which is (1/4) more than last year. How many fruit trees did you have last year?
一个果园，今年有果树800棵，比去年增加了(1/4)．去年有果树多少棵？
<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">800 / (5/4)</gadget>
<output>640</output>

<result>640</result>