The oil yield of a kind of peanut is 45%. If 180 kilograms of peanut oil is needed, how many kilograms of peanuts are needed?
一种花生的出油率是45%，如果要花生油180千克，需要花生多少千克？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">180 / (9/20)</gadget>
<output>400</output>

<result>400</result>