Question 363470
how much water should be added to 414 ounces of a 21% alcohol solution to get an 18% alcohol solution
how much water ------------0% alcohol-----------x ounces
alcohol ------------------ 21% alcohol----------414 ounces 
alcohol------------------- 18% alcohol----------(x+414)ounces
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concentration equation
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0+0.21*414=0.18(x+414)
0+86.94=0.18x+74.52
0.18x=86.94-74.52
0.18x=12.42
x=12.42/0.18
x= 69 ounces of water
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m.ananth@hotmail.ca