How much pure alcohol must be added to 400 ml of a 15% solution to make its strength 32%

Question

Mathematics

Dillon Cobb

1 January, 19:34

How much pure alcohol must be added to 400 ml of a 15% solution to make its strength 32%

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Answers (1)

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Rowdy · Answer 1

Quantity of alcohol = 400*15/100 = 60ml

x is pure alcohol which must be added : (x + 60) / (x + 400) = 32/100

100x + 6000 = 32x + 12800 = > 68x = 6800 = > x = 100

100ml pure alcohol must be added