SOLUTION: how many kilograms of a 30% acid solution must be added to 80kg of a 20% solution to produce a 28% solution?

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Question 159894: how many kilograms of a 30% acid solution must be added to 80kg of a 20% solution to produce a 28% solution?
Answer by Fombitz(13823) About Me  (Show Source):
You can put this solution on YOUR website!
Let's call the number X.
%2830%2F100%29X%2B%2820%2F100%29%2880%29=%2828%2F100%29%28X%2B80%29
30X%2B1600=28%28X%2B80%29
30X%2B1600=28X%2B2240
2X=640
X=320
320 kg of 30% solution is needed.