book Maths Puzzle Numerical Ability

Solve the system of equations. Describe what you are doing at each step in your solution process.

w+x+y+z=6
3w-x+y-z=3
2w+2x-2y+z+4
2W-x-y+z=-4

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book Other Question

John can run a certain course in 9 min and Henry can run it in 6 min. If they start at opposite ends and run towards one another, how long will they run before they meet? If y varies inversely as x^2, and y = 2 when x = 4, what is the constant variation?