exam Maths Puzzle Numerical Ability

The length of a rectangular playing field is 5 feet less than twice its width. If the perimeter of the playing field is 230 ft, find the length and width of the field.

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How are you? I need to solve an equation and would greatly appreciate your assistance. The equation is:

7 ln 3x = 28 Seven l(lower case L)n 3x = 28.

I worked it as follows A sailboat is anchored 24 yards from a point on the shore. The top of the mast of the sailboat is 25 yards from the same point on the shore. How tall is feet is the mast?