Replace each letter by a digit. Each letter must be represented by the same digit and no beginning letter of a word can be 0. O N E O N E O N E + O N E ------- T E N

Replace each letter by a digit. Each letter must be represented by the same digit and no beginning letter of a word can be 0.

O N E
O N E
O N E
+ O N E
-------
T E N

Solution :

Use trial and error. 0 =1, N = 8 ,E = 2, T = 7

1 8 2
1 8 2
1 8 2
+ 1 8 2
------
7 2 8