SOLUTION: How many gallons of a 3% salt solution must be mixed with 10 gallons of a 8% solution to obtain a 4% solution

Question 404584: How many gallons of a 3% salt solution must be mixed with 10 gallons of a 8% solution to obtain a 4% solution
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = gallons of 3% solution needed
In words:
(gallons of salt in final solution)/(total final solution) = 4%
given:
= gallons of salt in 3% solution
= gallons of salt in 8% solution
-------------------------------------

gallons
40 gallons of a 3% solution must be added
check answer:

OK
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