Question

If the number 53__39 is divisible by 11 then the what is the number

Answer 1

Let the missing digit be x

so the number is

53x39

If the difference between the sums alternate numbers should be 0 or multiple of 11

so sum of of alternate numbers = 5 + x + 9 = 13 + x

and 3 + 3 = 6

13 + x - 6 = 0

5 + x = 0

x = - 5 it is not possible

so

13 + x - 6 = 11

7 + x = 11

x = 4

so the required digit is 4

Answer 2

3
Because sum of even place digit number is 3+3=6
and
Sum of odd place digit number 9+5=14
14-6=8
Now
11-8=3
Required number is 3