The oil yield of a kind of rapeseed is 42%, how many kilograms of rapeseed are used to squeeze out 2100 kg of rapeseed oil in an oil mill.
一种油菜籽的出油率是42%，一个榨油厂榨出2100千克菜籽油，用了多少千克油菜籽．
<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">2_100 / (21/50)</gadget>
<output>5_000</output>

<result>5_000</result>