math
posted by M.A. .
A 9 percent saltwater solution is mixed with 4 ounces of an 18 percent saltwater solution in order to obtain a 15 percent saltwater solution. How much of the first solution should be used?
1 ounce
2 ounces
3 ounces
4 ounces
Explain your answer.

math 
Reiny
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
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