Answer / guest

J or 10

A simple one.

Assume that each character represents the number equivalent
to the position in the alphabet i.e. A = 1, B = 2, C = 3, D
= 4 and so on. Now let's check our assumption.

A + B = C i.e. 1 + 2 = 3

D - C = A i.e. 4 - 3 = 1

E - B = C i.e. 5 - 2 = 3

Thus, our assumption was Correct. Hence, D + F = J i.e. 4 +
6 = 10

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