asked in Mathematics+IQ challenge by (5 points) 3
replied by LEGEND (7,411 points) 4 14 37
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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