Question

Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains

5liters of natural oil for every 7 liters of synthetic oil. In order to make 684 liters of Petrolyn oil, how many liters of natural oil are needed?

Answer 1

So 5 liters of natural for every 7 synthetic, so 5 / 12 liters are natural oil.

so; 684 × (5/12) = 285 liters of natural oil

Hope this helps!