exam Maths Puzzle Numerical Ability

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Simplify :

3x^2m^5(2x^4m^2) divided by 3x^2m^5m^-4

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exam Other Question

(s-3/4t)(5t/s-7)-2 What would the volume be of a hot tub that is circular , 12 feet in diameter, 4 feet deep? This needs to be in cubic feet.