Uncle Wang's family harvested (5/4) tons of cabbage this year, and harvested less radish than cabbage (1/5). How many tons less radishes does Uncle Wang's family collect than cabbages?
王大伯家今年收获(5/4)吨白菜，收的萝卜比白菜少(1/5)．王大伯家收的萝卜比白菜少多少吨？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(5/4) * (1/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>