exam Maths Puzzle Numerical Ability

The perimeter of a rectangular window is 162 inches. If the height of the window is 80% of the width, find the dimensions of the window.."

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again another word problem..Fireworks are launched into the air. The quadretic function that models the fireworks' height, s(x), in feet, x seconds after they are launched is give Prove that for any sets A and B, if A is a subset of B, then A(upside-down U)B = A and A U B = B.
Thanks in advance for your help!