Problema Solution
How many liters of each 25% and 10% solution must be combined to produce 20 liters of 15% acid solution?
Answer provided by our tutors
let
x = the liters of the 25% solution
y = the liters of the 10% solution
25% of x + 10% of y = 15% of 20 liters
x + y = 20
0.25*x + 0.10*y = 0.15*20
by solving the system we find
x = 20/3 = 6 2/3 liters
y = 40/3 = 13 1/3 liters
we need 6 2/3 liters of the 15% and 13 1/3 liters of the 10% solution.