exam Maths Puzzle Numerical Ability

Can you please help me solve this problem?

Write down all possible subsets of {a, b, c, d}

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exam Other Question

Can you please help me with this word problem? At the football game 5/12 of the fans were rooting for the Cowboys. The rest were rooting for the Packers. What was the ratio of Cowboys fans to Packers fans? An employee who produces x units per hour earns an hourly wage of y = 0.55x + 12 (in dollars). Find the hourly wage for an employee who produces 20 units per hour.