SOLUTION: If 1 gallon of anti-freeze is 80% and 60 gallon is 25%, how many gallon of the 80% do you mix with the 25% to equal 70%?

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Question 424162: If 1 gallon of anti-freeze is 80% and 60 gallon is 25%, how many gallon of the 80% do you mix with the 25% to equal 70%?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Let x represent the number of gallon of the 80% needed

    Mixing to make the 70% solution

 .80x + .25*60gal = .70(60gal+x)

        .10x = .45*60gal

           x = 270 gal

CHECKING our Answer***

  .80*270 + .25*60 = .70(330) = 231