A classmate planted 400 sunflowers, and each sunflower harvested an average of 0.25 kg of sunflower seeds. If 0.18 kg of oil can be extracted per kilogram of sunflower seeds, how many kilograms of oil can be extracted from the sunflower seeds harvested in this shift?
某班同学种了400颗向日葵，平均每颗收葵花籽0.25千克．如果每千克葵花籽可以榨油0.18千克，这个班收的葵花籽可以榨油多少千克？
<gadget id="calculator">0.25 * 400 * 0.18</gadget>
<output>18</output>

<result>18</result>