Question

Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 3 liters of natural oil for every 4 liters of synthetic oil. In order to make 497

liters of Petrolyn oil, how many liters of natural oil are needed?

Answer 1

(3 / 7) * 497 = 213 liters of natural oil

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As a double check:

(4 / 7) * 497 = 284 liters of synthetic oil needed

213 + 284 = 491 liters

Explanation: