How many gallons of water must be mixed with 5 gal of 20% salt solution to make a 16% salt solution?
I put 5 over x and .2 over .16 and came up with 1.25 gal, which is the correct answer. I need to know if this is the correct way to work the problem so that I can use it later.
Hello, tigersblood!
I would equate the amounts of water in the mixture.How many gallons of water must be mixed with 5 gal of 20% salt solution
to make a 16% salt solution?
We have 5 gallons of solution which is 80% water: . gallons of water.
. . We will add gallons of water.
The mixture will contain: . gallons of water.
The mixture will be gallons of solution which is 84% water.
. . It has: . gallons of water.
We just expressed the final amount of water in two ways.
. . There is our equation! . . . .
Now solve for .