SOLUTION: Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 7 liters of natural oil for every 5 liters of synthetic oil. In order to make 636 liters of Petrol

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 7 liters of natural oil for every 5 liters of synthetic oil. In order to make 636 liters of Petrol      Log On


   

Question 1165786: Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 7 liters of natural oil for every 5 liters of synthetic oil. In order to make 636 liters of Petrol oil, how many liters of natural oil are needed?
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
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Let x be the number of these (7liters+5liters) portions in 636 liters of the mixture.  Then


    7x + 5x = 636

    12x     = 636

      x     = 636/12 = 53  portions.


ANSWER.  53*7 = 371 liter of the natural oil.

Solved.