Question

In each of the following numbers replace M by the smallest whole number to make the resulting number divisible by $9$.
(ii) $77548M$

Answer 1

Step: Find the value of M
Given number: $77548M$
A number is divisible by $9$ if the sum of its digit is divisible by $9$.
Here, the sum of digits = $7$+$7$+$5$+$4$+$8$+$M$
= $31$+$M$
The number next to $31$ which is divisible by $9$ is $36$.
So, the required number =$36$−$31$= $5$
Hence, the value of $M$ = $5$.