The oil yield of rapeseed is 38%, how many kilograms of rapeseed is needed for 950 kg of mustard oil.
油菜籽的出油率是38%，要榨菜油950千克，需要多少千克油菜籽．
<gadget id="calculator">38 / 100</gadget>
<output>19/50 = around 0.38</output>

<gadget id="calculator">950 / (19/50)</gadget>
<output>2_500</output>

<result>2_500</result>