exam Maths Puzzle Numerical Ability

Complete: If (x, 12, 13) is a Pythagorean triple, then x = ________

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THE ILLUMINATION FROM A LIGHT VARIES INVERSLEY AS THE SQUARE OF THE DISTANCE FROM A LIGHT. IF ILLUMINATION IS 10 UNITS WHEN DISTANCE IS 6 FEET, FIND THE ILLUMINATION WHEN DISTANCE IS 6 FEET. 3x^2(x+y)^2-6y^2(x+y)^2