Book Maths Puzzle Algebra

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If the cost of renting a canoe is a basic fee of $5 plus an additional charge of $2.50 for each hour that the canoe is r

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The horsepower that a rotating shaft can safely generate varies jointly with the cube of its diameter and its speed in revolutions per minute. A shaft with a 3-inch diameter turni jerry is 6 years older than his sister Dana. In two years the sum of the ages will be 42. How old are they now?

Stacey is 3 years younger than Travis. In 4 years the sum of th