Question

If the number $243x51$ is divisible by 9, then the value of digit marked as $x$ would be

• A. $3$
• B. $1$
• C. $2$
• D. $4$

Answer 1

The correct option is A $3$

We know that the divisibility condition for 9 is that the sum of the digits must be 9 or a multiple of 9
So, the sum of digits in the given problem $=15+x$ is divisible 9

$⟹15+x=0$ or $9$ or $18$ and so on
$⟹15+x=18$
$⟹x=3$