exam Maths Puzzle Numerical Ability

I need help with major help with this problem


Find the perimeter of the triangle

One side is 4
another is square5-square3
and the last side is square 5 + square 3

Thanks a million for the help

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exam Other Question
(2x-3)^2=25 Pls help me with this qn: One thousand cubes are arranged to form a large cube. All the surfaces of the large cubes are then painted. What fraction of the cubes are not painted at all?