exam Maths Puzzle Numerical Ability

Identify variables, inequality systems, cost equations, graph of feasibility region, corner points, and solution

Chris has a small carpentry shop in his garage to make bookcases

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exam Other Question
simplify and reduce:
6/x-5-1/3x-15+4/5-x
I did it and got:
-5/(3)(-1)(x-5) one person can do a job in 45 minutes, another can do the same job in 30 minutes. How quickly can they do the job if they work together?