In a petrolyn motor oil, in every 6 liters of
natural, there is also 5 litters of synthetic oil. So, if we put it in a formula,
it would be 6x+5x=11x of petrolyn motor oil. If 11x=847 petrylon oil, every x would
have 77 litters of petrolyn oil. Then that means that 6x=462 litters of natural,
which was needed in the 847 litters of petrylon oil.
