SOLUTION: How many liters of a 17% acid solution should be mixed with 8 liters of an 11% acid solution to obtain a mixture tha is 15%? Im just trying to study for a midterm, but I keep stru

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: How many liters of a 17% acid solution should be mixed with 8 liters of an 11% acid solution to obtain a mixture tha is 15%? Im just trying to study for a midterm, but I keep stru      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 663682: How many liters of a 17% acid solution should be mixed with 8 liters of an 11% acid solution to obtain a mixture tha is 15%?
Im just trying to study for a midterm, but I keep struggling on these.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

How many litershighlight%28x%29 of a 17% acid solution should be mixed with 8 liters of an 11% acid solution to obtain a mixture tha is 15%?

The idea is to algebraically show the 'mixing' 

with  amounts of total 'solution' and 'acid' on each side of an EQ

    .17x + .11*8L = .15(8L+x)

              .02x = .04*8L

                 x = 16L of the 17% solution needs to be added

and...

 .17%2A16+%2B+.11%2A8+=+.15%2A24 = 3.6L of acid involved

 

Donations on my website are appreciated.  Thanks.  ewatrrr

http://math-is-magical.weebly.com/index.html