Find the values of the letters in each of the following and give reasons for the steps involved


While adding A and 3 we obtain 6. There can be two cases.

(i) First step is not producing a carry


In that case,


A comes to be 3 as 3 + 3 = 6


Taking the first step in which the addition of B and 7 is giving A (i.e., 3), B should be a number such that the units digit of this addition comes to be 3.


It is only possible only when B = 6


In that case, A = 6 + 7 = 13


But, A is a single digit number


Hence, it is invalid.


(ii) First step is producing a carry


In that case,


A comes to be 2 as 1 + 2 + 3 = 6


Taking the first step in which the addition of B and 7 is giving A (i.e., 2), B should be a number such that the units digit of this addition comes to be 2.


But, it is possible only when B = 5 and 5 + 7 = 12



Hence, the values of A and B are 2 and 5 respectively


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