exam Maths Puzzle Numerical Ability

simplify: 5-2[3x-7(2-x)-5x]

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exam Other Question

You have 100 square meters of material. Which will hold more volume, a sphere or a cube made from that much material? How much more? Thank you Nick. How do I work this Problem out 2(3h-2)-2h=2(h-3)h=?
Thanks