Re 2 puzzles, solution

[N. J. A. Sloane]

Both Farideh Firoozbakht and Zakir F. Seidov sent in the
same solution.  Here is Farideh's:


> Lookup  18, 9, 11, 14, 7, 9, 12
> (Possible answers are: 5, 6, 14, 20

The answer to puzzle 1 is 6 because   18/2=9  9+2=11  11+3=14
                                      14/2=7  7+2=9   9+3=12
                                      12/2=6

> Lookup  4, 12, 6, 12, 36, 18, 36
> (Possible answers are: 108, 112, 128. 130. 134

The answer to puzzle 2 is 108 because  4*3=12    12/2=6     6*2=12 
                                       12*3=36   36/2=18    18*2=36    
                                       36*3=108

NJAS