Find all possible values of y for which the 4-digit number 64y3 is divisible by 9. Also, find the numbers.
We know that if sum of digits of a number is divisible by 9, then the number is divisible by 9.
Here,
6 + 4 + y + 3 = multiple of 9
y + 13= 0, 9, 18, …
Hence,
y + 13 = 18
∴ y = 5
The number will be 6453.