Problema Solution
a scientist needs 30 liters of a 60% solution. He has a 40% solution and a 70% solution. How many of each does he need to get 30 liters of a 60% solution?
Answer provided by our tutors
let
x = liters of the 40% solution
y = liters of the 70% solution
x + y = 30
0.40x + 0.70y = 0.60*30
by solving the above system of equations we find
x = 10 l
y = 20 l
click here to see the step by step solution of the system of equations
he needs to use 10 liters of the 60% solution and 20 liters of the 40% solution.