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Maths Puzzle
Numerical Ability
ax-b= cx-d; solve for x
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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
a small plane flying in the same direction as the wind, travelled 600 km in 2 h. The return trip, flying against the wind, took 3 h. Find the speed of the plane and the wind.