Question 1174157
Let x = Mary's favorite number
Let y = Mom's favorite number
The general formula for the encoded number is x*n + y, where n is the number's
position in the alphabet
41 = 6x + y
83 = 20x + y
Subtract the 1st from the 2nd:
42 = 14x -> x = 3
Thus y = 41 - 6*3 = 23
Therefore M = 13*3 + 23 = 62