SOLUTION: How many quarts of pure acid must be added to 5 quarts of a 30% acid solution to produce a 50% acid solution ?

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Question 808560: How many quarts of pure acid must be added to 5 quarts of a 30% acid solution to produce a 50% acid solution ?
Answer by josgarithmetic(39616) About Me  (Show Source):
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%285%2A30%2Bv%2A100%29%2F%28v%2B5%29=50 and solve for v; but this may be unreliable since the densities are necessary to know in practice.