exam Maths Puzzle Numerical Ability

How do you find the GCF and LCM for 90xy^2z^3, 300x^2y^2z^2, 120z^4?

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exam Other Question

A 40% sugar solution is added to an 85% sugar solution to create 1800mL of a 60% solution. how much of each solution is used? 3x > 2x - 4