# In the equation SEND + MORE MONEY, each letter represents a different digit (09). The addition is..

In the equation SEND + MORE MONEY, each letter represents a

different digit (09). The addition is done in the usual way from right to

left, first adding D and E to obtain Y (possibly with a carry-over), then

adding N and R, and so on. Develop a linear integer model to determine the

digit represented by each letter.