exam Maths Puzzle Numerical Ability

Please help me solve this equation:

2x-y+4z=-5
x+2y-z=6
x+y+z=1

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exam Other Question

please help me Indicate whether the problem is true or false show how you got it sin25 degrees = sin155 degrees An airplane took 2 hours to fly 600km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.