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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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tramserran

      Current Weight         Weight after adding Marbles

Giulio:    2x                          2x + 10                    

Jim:         x                             x + 5

You didn't post the options so hopefully you can determine the answer based on the info I provided above.

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