120 kg of a soybean can extract 30 kg of oil. According to this calculation, how many kilograms of soybeans are needed to extract 1 kilogram of oil.
一种大豆120千克可榨油30千克．照这样计算，榨1千克油需要大豆多少千克．
<gadget id="calculator">120 / 30</gadget>
<output>4</output>

<result>4</result>