SOLUTION: A chemist has 400g of salt solution that is 10% salt. How many grams of 20% salt solution must be added to obtain a 12% solution of salt?

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Question 482939: A chemist has 400g of salt solution that is 10% salt. How many grams of 20% salt solution must be added to obtain a 12% solution of salt?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
400x.10=40
40+n(.2)=.12(400+n)
40+.2n=48+.12n
.08n=8
n=8/.08
n=100
The chemist needs 100g of 20% solution for his mixture..