SOLUTION: How much pure alcohol must be added to 1200 ml of a 20% solution to make its strength 36%?

Question 695137: How much pure alcohol must be added to 1200 ml of a 20% solution to make its strength 36%?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How much pure alcohol must be added to 1200 ml of a 20% solution to make its strength 36%?
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Equation:
alc + alc = alc
0.20*1200 + 1*x = 0.36(1200+x)
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20*1200 + 100x = 36*1200 + 36x
64x = 16*1200
x = 300 ml (amt. of pure alc needed)
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cheers,
Stan H.
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