The oil yield of peanuts is 45%, how many kilograms of oil can be extracted from 40 kilograms of peanuts.
花生的出油率是45%，40千克花生可榨油多少千克．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">40 * (9/20)</gadget>
<output>18</output>

<result>18</result>