If every kilogram of sunflower seeds can extract 0.18 kilograms of oil, Xiao Ming's family will squeeze out a total of 45 kilograms of sunflower oil this year. How many kilograms of sunflower seeds did Xiao Ming use for oil extraction this year?
如果每千克葵花籽可以榨油0.18千克，小明家今年共榨葵花油45千克．小明家今年用于榨油的葵花籽多少千克？
<gadget id="calculator">45 / 0.18</gadget>
<output>250</output>

<gadget id="calculator">250 * 1</gadget>
<output>250</output>

<result>250</result>