What number should replace the question mark?
36 (36) 42 54 (25) 49 72 ( ?) 61
it be 121 (11x11)
72-61=11 11*11=121
27 28 32 93 54 40 48 64 48 67 84 64 55 50 ?
28 -> 9
52 -> 15
84 -> 23
20 -> 7
100 -> ?
83517
52649
30868
21781
0908?
