Maths Puzzle :: Discussion

Substitute digits for the letters

Substitute digits for the letters to make the following relation true.

W O R L D

+ T R A D E

-------------

C E N T E R



[Note that the leftmost letter can't be zero in any word. Also, there must be a one-to-one mapping between digits and letters.

e.g. if you substitute 3 for the letter W, no other letter can be 3 and all other W in the puzzle must be 3. ]