exam Maths Puzzle Numerical Ability

Suppose you receive a $50 gift certificate to the Cityside Music and Books store.All CDs at the store cost $9.99,and all books cost $5.99.You want to buy some books and at least on

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t+t^-1 A dog owner has 250 feet of fencing to enclose a rectangular run for his dogs. If he wants the maximum possible area, what should the length and width of the rectangle be?