Q9. Find the values of the letters in each of the following and give reasons for the steps involved.

Answers (1)

The additiion of B and 1 is 8  is giving a number whose ones digit is 8. this means digit B is 7 . 

B + 1 = 8 and no carry for next step.

next step :

Now, A + B = 1 => A + 7

which implies A = 4 

A  + B = 11 and 1 is carry for next step 

1 + 2 + A  = B

1 + 2 + 4 = 7 

Hence A = 4 and B = 7 is correct answer.

 

 

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