SOLUTION: how many litters of 45% saline solution and 70 % saline solution should be mixed to obtain 75 liters of 55 % saline solution?

Question 315635: how many litters of 45% saline solution and 70 % saline solution should be mixed to obtain 75 liters of 55 % saline solution?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In words:
(total liters of salt)/(total liters of solution) = 55%
Let = liters of 45% solution to be added
Let = liters of 70% solution to be added
given:
(1)

(2)
Multiply both sides of (1) by and subtract
(1) from (2)
(2)
(1)

and, since

45 liters of 45% solution must be mixed
with 30 liters of 70% solution
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