exam Maths Puzzle Numerical Ability

5x-2y=-5
y-5x=3

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Express 3log b x-4 log b y+1/2 log b z as a single logarithm and simplify if possible. I am at a total loss. Please help... Thank you very much in advance! the length of arectangle is is 4in grater than the width . the perimeter is 24in find the dementions