book Maths Puzzle Numerical Ability

(3x-2)(4x exponent3 - 2x exponent3 -2x +7x-5)

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The technology and communication office of a local company has set up a new telephone system so that each employee has a separate telephone and extension number. They A coffee merchant has coffee beans that sell for $9 per
pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?