Giulio's bag of marbles is twice as heavy as Jim's. If it takes 5 extra marbles to make Jim's bag feel heavier,it will take 10 extra marbles to make Giulio's bag feel heavier. This best illustrates

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This scenario describes Weber's law, which states that the just noticeable difference between two stimuli is proportional to the magnitude of the stimuli. In this case, the ratio of the extra marbles needed to make Giulio's bag feel heavier (10) compared to Jim's (5) is consistent with the ratio of the weight of their respective bags (2:1). This demonstrates Weber's law in action.

Giulio's Bag of Marbles Is Twice as Heavy as Jim's