Can we do the summation of 2 diffrent DFF

Summary

Suppose we have created 2 DFF 1. A and 2.B so can be we add the DFF A and B show the result in C

Content

Suppose we have created 2 DFF  1. A  and 2. B,  so can we add the both DFF A and B  and show the result in  C

Suppose if we entered the value  in DFF A  =  1 

Suppose if we entered the value  in DFF B =  10

Can we do the summation of DFF A ( 1) + DFF B ( 10 ) = and show the result in DFF C (11)

If yes, can you please share the detailed steps. 

Thanks in advance