Q10. Find the values of the letters in each of the following and give reasons for the steps involved.
The addition of A and B is giving a number whose ones digit is 9. The sum can only be 9 not 10 as a sum of two single digits cannot exceed 18. hence there will not be any carry for the next step
2 + A = 0
implies A = 8
2 + 8 = 10 and 1 is the carry for next step.
1 + 1 + 6 = A = 8
it satisfies hence A = 8 and B = 1 is the correct answer.