SOLUTION: How much pure alcohol must I add to 1 litter of 15% alcohol to produce a 35% alcohol solution?

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Question 571490: How much pure alcohol must I add to 1 litter of 15% alcohol to produce a 35% alcohol solution?
Answer by lwsshak3(11628) About Me  (Show Source):
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How much pure alcohol must I add to 1 litter of 15% alcohol to produce a 35% alcohol solution?
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let x= liters of pure alcohol to be added
15%*1+100%*x=35%(x+1)
.15+x=.35x+.35
.65x=.20
x=20/65=4/13
ans:
liters of pure alcohol to be added=4/13