exam Maths Puzzle Numerical Ability

Could I havehelp with this problem please* Find an equation of variation for the given situation. y varies inversely as the square of x, and y=6 when x=3

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what is the diference between two thirds and 1 quarter The trench for a sewer pipe is to be in the shape of a rectangular solid measuring 165 ft. long, 10 inches deep along both sides, and 15 inches wide at the top and the bottom. how