book Maths Puzzle Numerical Ability

Find the sum,diferrence,product,and quotientof the monomials 24z and 6z

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book Other Question

Solve the following inequality--
2x + 8<= -16 + 8x
If the inequality has no solution or is true for all real numbers, say so I have no idea how to solve this problem

The cooling system on a truck contains 5 gallons of coolant that is 40% antifreeze. How much must be withdrawn and replaced with %100 antifreeze to bring the mixture to 50% antifreeze?