exam Maths Puzzle Numerical Ability

-7x+y=20
9x-3y=36

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With a given tail wind, an airplane can travel 1080 mph in six hours. But flying in the opposite direction with the same wind blowing, the plane can fly only one-third of that dist Shims Shoes and Burglar Street Gear are in a competition for a good grade from the Bureau of Labor Statistics. Last year, Shims recieved a 75% grade from the Bureau for having only