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Oliver : 4 units

Benjamin : 1 unit + 50

4 units  = 1 unit + 50 + 100 = 1 unit + 150

1 unit = 150/(4 – 1) = 50

4 units = 4 x 50 = 200

Ans : 200 stamps. 

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Sorry, may I know how to draw model for your solution? Thanks!

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You could draw the model as follows :

Oliver : (1 unit) + (1 unit) + (1 unit) + (1 unit)
Benjamin : (1 unit) + (50)

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