Book Maths Puzzle Age Problem

Robert is 14 years old and his father is 38 years old. How many years ago was the father exactly seven time as old as his son?

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Book Other Question

A right triangle has an area of 84 square feet and a hypotenuse of 25 feet long what are the lengths of its other two sides? What is the %Body fat of a man that weighs 156 pounds (b) and has a waist measurement of 32 inches (w)?

(-98.42 + 4.15(w) - 0.082b)/b