exam Maths Puzzle Numerical Ability

Solve using the addition and multiplication principles.
4z - 3 > 3z - 13

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exam Other Question

Hello, please explain to me how I should set up a system of equations to solve this problem. How many liters of a 30% acid solution must be added to a 10% acid solution to obtain 32 liters of a 15% acid solution? x+3squart root x-8=0