let the amount to be added be x ounces
.09x + .18(4) = .15(x+4)
I suggest multiplying by 100, then it is easy to solve for x
A 9 percent salt-water solution is mixed with 4 ounces of an 18 percent salt-water solution in order to obtain a 15 percent salt-water solution. How much of the first solution should be used?
1 ounce
2 ounces
3 ounces
4 ounces
Explain your answer.
1 answer