SOLUTION: How much pure alcohol should be added to 500 ml of 16% solution to make it strength 30%

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Question 903910: How much pure alcohol should be added to 500 ml of 16% solution to make it strength 30%
Found 2 solutions by math_pro, richwmiller:
Answer by math_pro(4) About Me  (Show Source):
You can put this solution on YOUR website!
500 = 16%
x = 30%

x= 937.5


Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.16*(500)+x=.30(500+x)
80+x=150+.3x
.7x=70
x=70/.7
x=100
check
80+100=.3(600)
180=180
ok