exam Maths Puzzle Numerical Ability

b+17/b^2-1 - 1/b+1 = b-2/b-1

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exam Other Question

A wholesaler wants to blend coffee containing 35% caffeine with a coffee containing 15% caffeine to produce a 500 pound blend of coffee containing 18% caffeine. How much of each type of coffee is required? Please help with the following:

Find all solutions of the equation.

x^6 - 64 = 0

thank you