book Maths Puzzle Numerical Ability

Linear Systems

w+2x+3y-4z=-5
2w-x+y-2z=-7
3w-x-2y+z=7
4w-4x-2y+3z=3

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What is the prime factorization of the number 20 A flagpole is secured on opposite sides by 2 guide wires, each of which is 5 ft longer than the pole. The distance between the points where the wires are fixed to the ground is equ