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Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 5 liters of natural oil for every 7 liters of synthetic oil. In order to make 672 liters of petrolyn oil, how many liters of natural oil is needed?

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Publiusid
[tex] \frac{5}{13} = \frac{x}{672} [/tex]
[tex]13x=5*672[/tex][tex]13x=3360[/tex]
x=258.5 L of natural oil

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