The oil yield rate of a kind of rapeseed is 40%, how many kilograms of this kind of rapeseed is needed to extract 120 kg of oil?
一种菜籽的出油率为40%，要榨120千克的油，需要这种菜籽多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>