The oil yield of rapeseed is 42%, so how many kilograms of rapeseed are needed to extract 84 kg of oil?
菜籽的出油率是42%，要榨油84千克，需要油菜籽多少千克？
<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">84 / (21/50)</gadget>
<output>200</output>

<result>200</result>