SOLUTION: To make a mixture that is not less than 95% alcoho, how much pure alcohol must be added to 40 liters of a mixture of 85% alvohol?

Question 924778: To make a mixture that is not less than 95% alcoho, how much pure alcohol must be added to 40 liters of a mixture of 85% alvohol?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
We have 40 liter of 85% solution
We want to add some 100% solution to make 95% solution
1*x+0.85*40=0.95(40+x)
1*x+34=38+0.95x
1x-0.95x=38-34
0.05x=4
x=80 liter at 100% (80) is added to 40 liter at 85%(34) to make 95% of 120 liter(114)
check
1*80+0.85*40=0.95(40+80)
80+34=0.95(120)
114=114
ok
codemixadd

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