Asked by Glenn

Professor Beaker has a 50-milliliter solution containing 60% acid. How many milliliters of pure water should he add to this solution to produce a solution containing 40% acid?
Answered by Steve
see related questions below.
Answered by Glenn
I've tried looking at similar problems but I'm still confused.
Answered by Steve
the amount of acid in the parts must add up to the amount in the final mix. If x ml of water (0% acid) are added, then you need

.60*50 + 0x = .40(50+x)

Now just solve for x. This assume you know what "%" means ...
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