The oil yield of peanuts is 42%, how many kilograms of peanuts are needed to extract 210 kilograms of peanut oil.
花生的出油率42%，要榨210千克花生油，需要多少千克的花生米．
<gadget id="calculator">42 / 100</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">210 / (21/50)</gadget>
<output>500</output>

<result>500</result>