Problema Solution
A solution has 60% acid in it, and another solution has 90% acid in it. You take 20 liters of 60% solution, how many liters of 90% solution do you need in order to make a solution that is an 80% solution?
Answer provided by our tutors
let x = liters of the 90% solution needed to make 80% solution
0.60*20 + 0.90*x = 0.80(30 + x)
by solving we find
x = 120 l
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120 liters of the 90% solution is needed.