Problema Solution
How much water should be added to 10 ml of 15% alcohol solution to reduce the concentration to 5%
Answer provided by our tutors
let
x = ml of the water that needs to be added
the water is 0% alcohol so
0*x + 0.15*10 = 0.05*(x + 10)
by solving we find
x = 20 ml
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we should add 20 ml of water.