Problema Solution
a chemist needs 12 liters of a 50% solution. All she has available is a 20% solution and a 70% solution. how much of each of the two solutions should she mix together to obtain the desired solution
Answer provided by our tutors
let
x = liters of the 20% solution
y = liters of the 70% solution
a chemist needs 12 liters of a 50% solution
x + y = 12
0.20x + 0.70y = 0.50*12
by solving we find
x = 4.8 l
y = 7.2 l
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she should mix 4.8 liters of the 20% solution and 7.2 liters of the 70% solution.