SOLUTION: A chemist must mix 12 L of a 30% acid solution with some 80% solution in order to get a 60% solution. How much of the 80% solution should be used?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A chemist must mix 12 L of a 30% acid solution with some 80% solution in order to get a 60% solution. How much of the 80% solution should be used?      Log On


   

Question 897601: A chemist must mix 12 L of a 30% acid solution with some 80% solution in order to get a 60% solution. How much of the 80% solution should be used?
Answer by lwsshak3(11628) About Me  (Show Source):
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A chemist must mix 12 L of a 30% acid solution with some 80% solution in order to get a 60% solution. How much of the 80% solution should be used?
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let x=amt of 80% solution should be use
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30%*12+80%x=60%(12+x)
3.6+.80x=7.2+.60x
.20x=3.6
x=18
amt of 80% solution should be use=18 L
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