exam Maths Puzzle Numerical Ability

Could you please take the time to help me solve this question: Solve the following system of three linear equations: x - 2y = 4 and 2x - 3y + 2z = -2 and 4x - 7y + 2z = 6. Noting t

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i) Problem: In 1960, the United States generated 87.1 million tons of municipal solid waste and recovered (recycled) only 4.3% of it. The amount of municipal solid waste generated The range of hourly wages for 15 employees of a small company starts at $7.50 and ends at $21.40. If only one worker receives the median wage of $8.90, how many workers receive a h