exam Maths Puzzle Numerical Ability

One printer can print the paychecks for the employees of a company in 54 min. A second printer can print the checks in 81 min. How long would it take to print the checks with both printers operating?

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exam Other Question

The lenght of a rectangle is 4m greather than its width. The perimeter of the rectanlge is 36 m. What are the dimensions of the rectangle?
This is for Algebra 1, word problems systems of linear equations. I need help solving this equation: x^2 - 2x = 8. I get -2x(x+4) thank you for your help