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OpenStudy (anonymous):
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. If 399 liters of natural oil are used, how many liters of Petrolyn oil will be made?
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OpenStudy (welshfella):
the fraction of natural oil in the petrolyn = 7/11 fraction of synthetic oil = 4/11
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