SOLUTION: a chemist mixes 8 l of 40% acid solution with some unknown quantity of 70% solution to get a 50% solution. How much 70% solution is used ?

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Question 942753: a chemist mixes 8 l of 40% acid solution with some unknown quantity of 70% solution to get a 50% solution. How much 70% solution is used ?
Answer by lwsshak3(11628) About Me  (Show Source):
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a chemist mixes 8 l of 40% acid solution with some unknown quantity of 70% solution to get a 50% solution. How much 70% solution is used ?
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l=liter
let x=amt of 70% solution used
40%*8+70%x=50%(8+x)
3.2+.70x=4+.50x
.20x=0.80
x=4
amt of 70% solution used=4 l