Question

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
792liters of Petrolyn oil, how many liters of natural oil are needed?

Answer 1

Out of every 11 liters of Petrolyn, 7 are natural, and 4 are sythetic. So:
792/11=72
72x7=504 liter of natural oil needed
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