exam Maths Puzzle Numerical Ability

Find x:y:z, if 2x+y-5z = 0 and 3x-2y-4z=0
a)1:2:1 b)1:1:1 c)1:1:2 d)2:1:1

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exam Other Question
Factor completely: x^2 - 8x + 16. square root of 2 divided by the square root of 6 plus 2