exam Maths Puzzle Numerical Ability

Multiply. (2x - 5y)(3x - y)

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exam Other Question

Find the selling price per pound of a coffee mixture made from 8 pounds of coffee that sells for $9.20 per pound and 12 pounds of coffee that sells for $5.50 per pound.

Thank you x=sqrt(4-y^2) ---I have to get "y" by itself?