The oil yield of a kind of rapeseed is 35%, how many kilograms of rapeseed are needed to extract 1400 kg of oil.
一种油菜籽的出油率为35%，要榨1400千克油需多少千克油菜籽．
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1_400 / (7/20)</gadget>
<output>4_000</output>

<result>4_000</result>