exam Maths Puzzle Numerical Ability

I asked this question a few days ago and I am waiting for an answer. I hope I will get one today.
Suppose that you save for retirement by contributing the same amount each month

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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.

Thirty one times the total of towice t and 2 is greater than or equal to -6