Question 424162
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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