SOLUTION: if i have 100 bottles of 100% alcohol and an unlimited supply of 50% alcohol how many 50% would i have to add to make it 80%

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Question 895955: if i have 100 bottles of 100% alcohol and an unlimited supply of 50% alcohol how many 50% would i have to add to make it 80%
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
if i have 100 bottles of 100% alcohol and an unlimited supply of 50% alcohol how many 50% would i have to add to make it 80%
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let x=number of 50% bottles to add
100-x=number of 100% bottles to use
..
50%x+100%(100-x)=80%*100
.50x+100-x=80
.50x=20
x=40
100-x=60
number of 50% bottles to add=40