Question 258077
What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol. 
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Equation:
alcohol + alcohol = alcohol
0.95x + 0.15(10-x) = 0.45*10
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Multiply thru by 100 to get:
95x + 15*10 - 15x = 45*10
80x = 30*10
x = (1/8)30
x = 3.75 liters (amt. of 95% solution in the mixture)
10-3.75 = 6.25 liters (amt. of 15% solution in the mixture)
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Cheers,
Stan H.