Book Maths Puzzle Age Problem

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?

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Book Other Question

How many pints of pure acid must be added to 5 pints of a 20% acid solution to yield a 50% acid solution? Mark paid $26 for a CD player that was listed for $40. What rate of discount did he recieve?