The oil yield of a kind of rapeseed is 40%, how many kilograms of this kind of rapeseed is needed to make 200 kg of rapeseed oil.
一种油菜籽的出油率是40%，打200千克菜油要这种油菜籽多少千克．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">240 / (2/5)</gadget>
<output>600</output>

<result>600</result>