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Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 7 liters of natural oil for every 4 liters of synthetic oil. In order to make 682 liters of Petrolyn oil, how many liters of natural oil are needed?

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foryourhonour7008

P ＝ N + S

N/S＝7/4

[tex]n = \frac{7}{4} s[/tex]

p＝682

[tex]682 = \frac{7}{4} s + s[/tex]

[tex]682 = \frac{11}{4} s[/tex]

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