mathematics - Alphabet Number Matching

If :

888888 = T 

777777 = O

555555 = Y


444444 = R

then :

666666 = ? 

Basically you need to tell the logic along with the solution to the puzzle.

Answer

I think the answer is

X

Explanation

8 X 6 = FORTY EIGH(T) 7 X 6 = FOURTY TW(O) 5 X 6 = THIRT(Y) 4 X 6 = TWENTY FOU(R) 6 X 6 = THIRTY SI(X)