Problema Solution
A scientist has in his laboratory a drum of a 35% muriatic acid solution and another which is 20% muriatic acid. How many liters of the first must he add to three liters of the second to produce a solution which is 25% muriatic acid?
Answer provided by our tutors
let
x = liters of the 35% muriatic acid solution, x>0
0.35x + 0.20*3 = 0.25(x + 3)
by solving we find
x = 1.5 l
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1.5 liters of the 35% muriatic acid solution must be added.