From the ff: equations:

................factors .... products.................. variables

...............z e r o = 0.....................................a = ?

.................o n e = 1.....................................b = ?

.................t w o = 2.....................................d = ?

.............t h r e e = 3.....................................e = ?

................f o u r = 4......................................f = ?

.................f i v e = 5.....................................g = ?

...................s i x = 6.....................................h = ?

............s e v e n = 7......................................i = ?

.............e i g h t = 8.......................................l = ?

...............n i n e = 9......................................m = ?

..................t e n = 10....................................n = ?

..........t w e l v e = 12....................................o = ?

..........t w e n t y = 20....................................r = ?

......... .....f o r t y= 40....................................s = ?

..............s i x t y = 60.....................................t = ?

......s e v e n t y = 70.....................................u = ?

..........n i n e t y = 90.....................................v = ?

...3 h u n d r e d = 300..................................w = ?

5 t h o u s a n d = 5000.................................x = ?

......8 m i l l i o n = 8000000............................y = ?

.......1 b i l l i o n = 1000000000......................z = ?

I got values for each letter by trial and error using excel yet i wanted to

know if there are other solution sets for this type of problem . Is there a

unique values for all the factors or any of them? If number of unknown is

same as that of equations should I assume values?