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Find the values of the letters in each of the following and give reasons for the steps involved Q - 8

Q8. Find the values of the letters in each of the following and give reasons for the steps involved.

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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

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