Talking A = 1,
B = 2,....,  T = 20,.....,  Z = 26,
We have :
AT = A x T = 1 x 20 = 20.
BAT = B x A x T = 2 x 1 x 20 = 40.
Similarly, CAT = C x A x T = 3 x 1 x 20 = 60.