exam Maths Puzzle Numerical Ability

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?

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exam Other Question
The feasible region of a maximization problem shown is determined by:
12x+5y< or equal to 180
5x+4y< or equal to 98
x^3 0, y> or equal to 0

Which of the following objective f 5y - 3z + 4y - 1z - 3y; y = 3 and z = -2