exam Maths Puzzle Numerical Ability

Simplify

x/x 2nd power - 16 + x 3rd power/x 2nd power - 14x + 40

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exam Other Question

1. A tank holds 80 liters of a chemical solution. Currently the solution has a strength of 30%. How much of this should be drained and replaced with a 70% solution to get a final s can you please help me solve and check: (((2.4x-1.2x=4.8)))