Question

The least value given to ${}^{\prime }{a}^{\prime }$ should be ___ so that the number $653a47$ will be divisible by 11?

Answer 1

To check the divisibility by 11:

$(7+a+5)-(4+3+6)=0$ or a multiple of 11

$12+a-13=0$ or multiple of 11

$a-1=0$

$\therefore$ $a=1$