exam Maths Puzzle Numerical Ability

what is this anwser to this question? -54 decreased by the difference between-37 and 15

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The length of a rectangle is 8 inches more than twice its widths. If the perimeter of the rectangle is 64 in, find the width of the rectangle.
the cos of an angle is -0.5. Determine the angle if it is in the second quadrant. What is the angle if it is in the tird quadrant?