Problema Solution
A 60 oz solution has a salt concentration of 20%. How many ounces of pure salt must be added to the solution to raise its concentration to 25%?
Answer provided by our tutors
From the given information, we can write:
60(.2)+x(1)=(60+x)(.25)
Where the right hand side of the equation represents the final solution that will be made with a volume of '60+x' and a concentration of 25%. The left hand side represents the components to be added. One is 60oz with a concentration of 20%. The other is 'x' oz at 100% (pure). Solving for x, we get:
x=4 oz
This is the amount of pure salt that must be added.