Question

Question 8
Find the values of the letters in the following and give reasons for the steps involved.
$A1$
$\underset{–}{+1B}$
$\underset{–}{B0}$

Answer 1

Unit place of B+1 is 0 So B=9
On putting B = 9, we get 9 + 1=10 Putting 0 at ones place and carry over 1, we get
$\Rightarrow$ A + 1 + 1 =B
As B=9
$\Rightarrow$ A + 1 + 1 =9

Hence, A = 7 and B =9