Solution to: Word Sums
It is given that the digits 1 and 6 are the most frequently used, so we first look how often each letter occurs in the puzzle:
- M, V, and P occur once;
- T occurs twice;
- A, R, and E occur three times;
- S occurs four times;
- N and U occur five times.
So either N=1 and U=6, or N=6 and U=1. Since even 9999 + 99999 + 999999 + 999999 is less than 6000000, N cannot be 6. So N=1 and U=6.
We now have:
mars ve16s 6ra16s sat6r1 ------- + 1ept61e
R+6+6+R (in the 'tens' column) is even, but since its sum ends on a 1, 1 must have been carried from the 'units' column. We can also see that R=4 or R=9. The fact that 1 is carried from the 'units' to the 'tens' column gives the following possible values for S:
- S=3, so S+S+S+1=10, and therefore E=0;
- S=4, so S+S+S+1=13, and therefore E=3;
- S=5, so S+S+S+1=16, and therefore E=6: this is not possible because U=6.
Depending on the values of S and E, we now have:
S=3 and E=0: S=4 and E=3: mar3 mar4 v0163 v3164 6ra163 6ra164 3at6r1 4at6r1 ------- + ------- + 10pt610 13pt613
From the previous step, we know that R=4 or R=9. We first look at the case S=3. If R would be 4, a value of 2 would be carried from the 'tens' to the 'hundreds' column. So the sum of 2+A+1+1+6 must end on a 6, which gives A=6. This is not possible because U=6. So, if S=3, then R must be 9 and a value of 3 is carried from the 'tens' to the 'hundreds' column. So the sum of 3+A+1+1+6 must end on a 6, which gives A=5.
We now look at the case S=4. In this case, R can only be 9. Then a value of 3 is carried from the 'tens' to the 'hundreds' column, which gives A=5.
Therefore, regardless of the values of S and E, we know that R=9 and A=5. Depending on the values of S and E, we now have:
S=3 and E=0: S=4 and E=3: m593 m594 v0163 v3164 695163 695164 35t691 45t691 ------- + ------- + 10pt610 13pt613
In either case, a value of 1 is carried from the 'hundreds' to the 'thousands' column. In the case that S=3 and E=0, the sum of 1+M+0+5+T must end on T, which gives M=4. In the case that S=4 and E=3, the sum of 1+M+3+5+T must end on T, which gives M=1. This, however, is not possible because U=1. From this, it follows that S cannot be 4, so we now know that S=3, E=0, and M=4.
We now have:
4593 v0163 695163 35t691 ------- + 10pt610
The only remaining digits are now 2, 7, and 8. Since a value of 1 is carried from the 'thousands' to the 'ten thousands' column, it follows that V=2 and P=7. For T, only the value 8 remains.
The complete addition is as follows:
4593 20163 695163 358691 ------- + 1078610
Conclusion: neptune equals 1078610.