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Answer

(a)
James : 1 unit + 33 + 33
Susan : 1 unit + 33
Total : 2 units + 99
289 – 99 = 190
190/2 = 95 (1 unit)
or
289 – 33 = 256
256/2 = 128 (Susan at first)
128 – 33 = 95

(b)
95 + 33 + 33 = 161
or
128 + 33 = 161 (James at first)

Ans : (a) 95 stamps; (b) 161 stamps.

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