exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Could someone pleae explain how to work this problem out?
Factor the following polynomials 4ux+20u+vx+5v. Thank you
what does the y stand for in this equation

3y+6=13