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asked in Mathematics+IQ challenge by (5 points) 1
replied ago by LEGEND (5,826 points) 4 11 25
You can do this in excel or manually as follows:

27     diff

54      27     diff

86      32      5       diff

128     42     10      5        diff

187     59     17       7        2        diff

272     85     26       9        2         0

Your number is 128

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