The quotient, when difference of the number 53 and the number obtained on reversing its digits is divided by 2 :

1. 8

2. 9

3. 3

4. 18

For

$\begin{matrix} & 1 & 2 & \text{A} \ - & & \text{A} & 9 \ \hline & & 4 & 8 \ \hline \end{matrix}$

the value of digit A is :

1. 6

2. 7

3. -1

4. none of these

Find the quotient when the difference between 94 and 49 is divided by :

(a) 5

(b) 9

If a = b, show that abc = bac.