in Mathematics+IQ challenge by 1 4 7
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

1 Answer

0 votes
27 54 86     187 272

   27  32   x    y 85

        5    10 15 30

5^2+5, 5^2+60 in between terms-5^2+17=42 so, next  term is 42+86=128
by 1 3
4,093 questions
13,899 answers
5,339 comments
4,042 users