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Give them stock answers that any website/book has taught you.
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By trying to move through my logic step by step. The question was more to see how my brain worked than finding an answer. I had 0 experience in the field. Less
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Made some back-of-the-envelope calculations with ballpark figures, came up with a semi-realistic estimate. Appeared to be much more of a test of my way of approaching the problem than of my actual knowledge of catastrophe modelling. Less
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A round manhole cover cannot fall through its circular opening, whereas a square manhole cover could fall in if it were inserted diagonally in the hole. Circular covers don't need to be rotated or precisely aligned when placing them on the opening. A round manhole cover is easily moved and rolled. Less