Answer :
answer
Since we have given that
ADD = 4
BAD = 7
CAD = 8
As according to letters in the English alphabets, we get that
A is at place 1.
B is at place 2.
C is at place 3.
D is at place 4.
So, ADD = 1+4+4 = 9
BAD = 2+1+4 = 7
CAD = 3+1+4 = 8
So, According to this pattern, we get that
ADA = 1+4+1 = 6
Hence, the value of ADA is 6.