SOLUTION: How much of a 30% solution do you need to add to a 280ml to obtain a 4% solution?

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Question 1155273: How much of a 30% solution do you need to add to a 280ml to obtain a 4% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How much of a 30% solution do you need to add to a 280ml to obtain a 4% solution?
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Depends.
280 ml of what?