exam Maths Puzzle Numerical Ability

5y - 3z + 4y - 1z - 3y; y = 3 and z = -2

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exam Other Question

How many kilograms of coffee beans selling for $2.40 per kilogram should be mixed with 4 kilograms of coffee beans selling for $3.60 per kilogram to obtain a mixture selling for $2.88 per kilogram? Solve logx + log(x-48) = 2