Book Maths Puzzle Percentage

How many pints of pure acid must be added to 5 pints of a 20% acid solution to yield a 50% acid solution?

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Book Other Question

Two planes leave an airport, traveling in opposite directions. After 4 hrs, the planes are 4,600 miles apart. One plane is traveling 50 miles per hour faster than the other plane. Alex is 5 yrs older than his brother Max. In 7 yrs, the ratio of Alex's age to Max's age will be 4 to 3. What are their present ages?