Giulio's bag of marbles is twice as heavy as Jim's.If it takes five 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 best illustrates 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 extra "weight" or number of marbles needed to make Jim's bag feel heavier is proportionally less than the extra weight or marbles needed for Giulio's bag because Giulio's bag is twice as heavy to begin with.

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