exam Maths Puzzle Numerical Ability

I am trying to make a real life application of a linear function using this information.
Loan debt has skyrocketed over the past 10 years. According to the most recent data from t

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How many pounds of coffee at 4.00 a pound must be mixed with coffee at 20.00 a pound to make 50 pounds of coffee that are worth 10.00 a pound? 1) Working alone, Coleen can paint a house in 2hr less than James. Working together, they can paint the house in 10hr. How long would it take James to paint the house?