The oil yield rate of soybeans is 16%. To extract 64 kg of soybean oil, how many kilograms of soybeans are needed.
大豆出油率是16%，要榨豆油64千克，需用大豆多少千克．
<gadget id="calculator">16 / 100</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">64 / (4/25)</gadget>
<output>400</output>

<result>400</result>