Q8. Find the values of the letters in each of the following and give reasons for the steps involved.
The addition of 1 and B gives a number whose ones digit is 0. this is possible when digit B = 9 .
1 + B = 10 and 1 is the Carry for the next step
Now, A + 1 + 1 = B => 9
Implies A = 7.
Hence A = 7 and B = 9 is Correct answer