How many gallons of 20% salt solution must be mixed with 4 gallons of 40% salt solution to make 25% salt solution?
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6
Answer:
4% gallons of 20% salt solution be needed
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5
Answer:
since 25% is smack in the middle between 20% and 30% it will take a equal volum of each to make a 25% solution . Since 4 gallons of 30% solution was used, so 4 gallons of 20% solution will be needed.
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