SOLUTION: Please help me solve this problem. How many grams of salt must be added to 40 grams of a 28% salt solution to obtain a 40% salt solution?

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Question 250213: Please help me solve this problem. How many grams of salt must be added to 40 grams of a 28% salt solution to obtain a 40% salt solution?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x+.28*40=.40(40+x)
x+11.2=16+.40x
x-.40x=16-11.2
.6x=4.8
x=4.8/.6
x=8 grams of salt are used.
Proof:
8+.28*40=.40(40+8)
8+11.2=.40*48
19.2=19.2