The number terms

Puzzle Question:

If A+B=C, D-C=A and E-B=C, then what does D+F stands for? Provide your answer in letter terms as well as in number terms.

Answer --

Solution of Puzzle:

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

Toughness:

Intermediate