Physics (Please help!!!)

If you are given many closed sacks filled with different amounts of identical marbles, how could you determine the weight of a single marble without opening the sacks? (Assume the weight of the sack material can be ignored.)

The only thing I could think of was to weigh the bag but its says to ignore the weight.

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  1. Look for the greatest common divisor of all bag weights.

    http://en.wikipedia.org/wiki/Greatest_common_divisor

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