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Heavier Cans

You have two identical cans of peas, which you weigh on a perfectly accurate scale, and find that each one weighs exactly 1 pound. (All weighings are done in the same location, at sea level, on the surface of the earth.) You have another can which is exactly the same size as either of the cans of peas, but is filled with a denser material. You weigh this can on the same scale and it gives you a weight of exactly 2 pounds. Is the combined mass of the two cans of peas less than, equal to, or greater than the mass of the single can of unknown substance?

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